Elasticsearch inner hits performance I am considering indexing each job as its own document (especially since the ElasticSearch documentation says that inner_hits is an experimental feature) but for now, I am trying to see if I can accomplish what I want to do using the inner_hits and nested features of ElasticSearch. Here is the query { "from": 0, "size": 2500, The inner hits feature can be used for this. Elasticsearch improve query performance. Inner_hits aggregation is not supported by elasticsearch. 1. Elasticsearch: Elasticsearch version: 5. 6. Elasticsearch aggregations on nested inner hits. Indicates whether soft deletes are enabled on the index. The ES documentation states that top_hits should not be used as a top-level aggregation and one should use the collapse parameter instead - that's why I went for collapse in my query. music for flute, violin, and soprano or for 2 violins and soprano. The top level inner hits and inner hits defined on a query internally to ES is the same thing and either way of defining inner hits will yield the same performance in terms of query time. Also we should better document the cost of fetching source for nested inner hits and the fact that one can just Struggling with inner-hits on elasticsearch. elasticsearch; elasticsearch-jest; Elasticsearch inner hits in java api. For instance the sort option is already exposed so applying the rescorer of the main search request might not be always compatible. Elasticsearch: Return Inner hits are slow indeed. A workaround is to change the simple object to be a nested document as well. :) – This feature returns per search hit in the search response additional nested hits that caused a search hit to match in a different scope. So if query result contains 2 library documents, each has sorted array with only it's own books , but what I want to achieve My preference goes to option A. Thanks Val, inner_hits works, but it sorts (and paginates) nested objects only in scope of it's parent document. Rescorers can be cascaded so a single window_size would be confusing. I also highly recommend reading elasticsearch docs, which are good source. 17] › Cross-cluster search, clients, and integrations. dateFrom<attributeXYZ. dateTo>attributeXYZ. code) where condition is for example snapshots. the thing that i don't understand is why removing one of the following parts improve the performances by ten times. It makes things way slower, especially when you are recovering so many documents (you can take a look to this discusion: Elasticsearch query performance. This feature returns per search hit in the search response additional nested hits that caused a search hit to match in a different scope. Query a multi level nested document at different levels. ElasticSearch search perfomance. 20 Spring Data Elasticsearch - Is Inner Hit supported at root level on query? 0 Querying specific Elastic Search Node - Do both does the The number of inner hits being returned is based on: size * number_of_inner_hits_definition * size_in_inner_hits. For instance, appending this to your URL will make sure that you won't find any inner hits inside your aggregation?filter_path=hits. I am pretty new to elasticsearch and have been trying to create a query which would return me a record that matches all the must conditions of a bool-query. I've also seen that nested aggregations are much worse here. ElasticSearch Index API SLOW. . If you didn't need inner_hits, you could combine each nested query with a term query on the "_index" metadata field that targets the respective index name in each case, such Hi, I'm struggling how to apply a post_filter to some nested documents. Aggregation on filtered, nested inner_hits query in ElasticSearch. As you say, it looks like inner_hits property is missing within NEST; I'll open an issue to add this for the next release now. keep the items whereby there are two collapsed items within inner hits. I'm using field collapsing on item_id, but is there a way to to compute the Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Hello, It is stated clearly that: Because nested documents are indexed as separate documents, they can only be accessed within the scope of the nested query, the nested/reverse_nested, or nested inner hits. _source For that, we are using inner_hits query. Changelog , Documentation , and I also found a single blog post from a company that I have a parent/child relationship that queries very performantly but when retrieving innerhits falls over. The max_concurrent_group_searches request parameter can be used to control the maximum number of concurrent searches allowed in this phase. 3. attribute1="Some value" AND attributeXYZ. What I'd like to do is have some aggregation on all my nested documents, but have only certain nested documents returned (the general idea of a post_filter). I'm succesfull in applying the post_filter to filter out the root (parent)-documents, but not in filtering the inner hits on this document. limit : the max number of distinct nested mappings that can be found in an index. How to sum inner hit score in elasticsearch? Ask Question Asked 4 years, 1 month ago. I tried your suggestion and the total numbers for hits still does not take into consideration the fact that documents are being aggregated - it's the # of documents in total, i tried to use inner_hits - but to no use. Changelog, Documentation, and I also found a single blog post from a company that tried this new feature and measured their performance gains. com Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Relative Performance of ElasticSearch on inner fields vs outer fields. Inner hits can be used by defining an inner_hits definition on a nested, has_child or has_parent query and filter. What I need to do is via a post filter (or alternative) remove the results from the final list whereby the inner hits total is 1 and not 2, however post filter can not find the inner hits for each entry and hence the total is not available. dateTo,snapshots. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Then, once you have a Map, the hits are under: hits. Useful when multiple inner hits have been defined in a single search request. This aggregation I am doing in the following block is aggregating on the main document and all objects in "queries", and not just the ones in Searching inner hits in ES datastore - Elasticsearch - Discuss the Loading We're using Elasticsearch to return distinct search term suggestions from roughly a dozen different fields across a fairly large set of data. The bug occurs if the nested documents is inside a simple object. Are there any significant performance differences between using the top_hits aggregation vs the new collapse I am currently exploring elasticsearch in python using the elasticsearch_dsl library. name. My mapping for the object is as below: Let's go to the point, i'm trying to get child when its parent executed with has child query. doc_count,aggregations. We also need to be Unless you totally exclude the _source, elasticsearch still has to load for each of the 10 documents per shard the full _source and then parse it to remove the excluded keys. This can significantly slow your search if you have too many groups or inner_hit requests. randel_2 (randel-2) June 20, 2018, 12:28pm 1. dateFrom? Field collapsing is a query-time directive that, when combined with the optional “inner-hits” sub-directive, results in Elasticsearch grouping the results by a specified field. Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Is it possible to disable certain inner_hit fields in the response from the Search API. How can i make elasticsearch return only the value's of inner_hits? Here is my query: I want elasticsearch to return me the documents that have matches, and to sort the "inner_hits" based on the order the query terms matched the nested documents. According to the documentation of inner_hits it should be possible to use a script to sort the nested inner_hits of a document. if I search for the query "red sports car", I want ES to return me the Is it possible for Elasticsearch to return only the needed data (the contents of then "hits" field) without being embedded within all the other meta data? I know I could parse the result into JSON and extract it, but I don't want the complexity, hassle, performance hit. Is there any way, like scrolling, to navigate between inner_hits without having to increase the “max_inner_result_window”? Because if I have a thousand records or more, it won't make sense to have to increase this. While the documentation of While the documentation of inner hits shows that sort can be used to overwrite the default sorting (by _score) of my inner hits I can't seem to access `_score' itself. The reason behind it is that inner_hits is a very expensive operation and applying aggregation on inner_hits is like exponential increase in complexity of operation. Inner I always need just one nested document, so I made use of inner_hits to include in the response only the required nested document (1 out of 100). What would be the best way And finally the problem to be solved: how to modify the query to filter out documents having resulted in "H" for visibility with highest priority in inner hits? Or what other query will return a set of documents with visibility of highest priority filtered by provided claim ids, but only those where visibility is not "H"? Listing: item_id seller_id price I want to group together all listings for the same item, and show the average price across all sellers. I cant see why removing one of this See Retrieve inner hits. 0. key,aggregations. e. or nested inner hits. As of each hit, an nested inner hit query will be made, if my search result hits 20 million records, for each of those 20 million, it will make an inner hit query, will it not degrade the performance? I have gone through # of articles for the same, but most of them are for the older versions, here is one of the discussion: https://github. attributeXYZ="Some value" AND snapshots. dateFrom? I've just upgraded to Elastic Search 1. We also need to be The problem is that one user might have thousands of photo's and each time a search is ran it return's hits: full object's of the profiles( with the nested photos ). Help needed for: I tried my best but I didn't find any method with-in JEST client to parse inner_hits along with the source. class); SearchPage<Entity> I have a collection of documents which all contain an array of nested objects with important data. It is true that Elasticsearch already computed this information, but at the same time, there could be matches and it would require a lot of memory to keep track of this information for all matches. By default the hits are sorted by the score. Please consider this as a follow up question of this. If #23917 doesn't give the desired performance improvements we can reconsider. Inner hits parameter for request body search API edit. What you are trying to achieve is possible. Elasticsearch inner_hits is very slow #56210. We have many hits and it is taking up unnecessary memory. I want do to an aggregation on these which returns me the first document, last document, and all of the nested objects in that group. An ex I'm trying to get inner hits to work for an 'AND'ed nested queries (using bool-must) Basically, it's two nested queries under a must, but I only seem to get inner-hits from one branch, even though it's a MUST, so both branches must have hit. The bool-query is wrapped inside a constant_score: filter. A response document from query with "has_child" clause with inner_hits has a structure similar to this: "hits From bugs to performance to perfection: pushing code quality Specifying total size of results to return for ElasticSearch query when using inner_hits. Returning the inner_hits should be done in the SearchHit<T> class and not by exposing internal Elasticsearch data. Related questions. lang. Yes, that is the problem. The name to be used for the particular inner hit definition in the response. search(query, Entity. 10. I can return all privileges with inner_hits and The problem is that the "inner" inner_hits does not work: for the first inner_hits clause we obtain the "real" inner-hits for the members field; but for the second inner_hits clause I get following result for members. To accomplish this, we're currently using 'terms' and 'top_hits' aggregations (the terms aggregation uses a wildcard term). Elastic version : 7. 17. If you want aggregation on inner_hits you can probably use the following approach: Have you tried moving the inner_hits section to the innermost nested query? – Val. The documentation of Sort suggests that I can access _sort and _doc. Inner hits can be used by defining an inner_hits definition on a nested, has_child or has_parent query and filter I recently upgraded from Elasticsearch 6 to 7 and stumbled across the 10000 hits limit. for more details. I am new to ElasticSearch and haven't used script fields yet, but was hoping I wouldn't have to and that there might be some easier solution that I was missing. Option A would also be aligned with the fact that inner_hits build a complete search request. 4 Elasticsearch _query vs _search. **. To obtain this i can remove the inner_hits in the aggregations, the top_hits on the nested query or span queries in the functions scores. Do anyone meet with this problem?) Request to elasticsearch using Postman: Creating indices with soft-deletes disabled is deprecated and will be removed in future Elasticsearch versions. I was expecting a performance improvement (less data, traffic, processing, etc) but the execution time increased with at Is it possible to select inner hits objects from the snapshots (fields snapshots. mapping. 3 Plugins installed: [discovery-ec2, repository-s3, x-pack] started using the new field collapsing functionality and I noticed that the search post_filter is not applied to the inner_hits. The nested inner hits support in the query dsl was left out to reduce complexity and most of the times there is just a single level relationship. 11. I am trying to do some aggregations on the inner_hits of a nested object (queries), which are filterated based on the query date. It looks like that information is available in the inner_hits array in the results, but I need it within the terms aggregation script field. Elasticsearch Partial Fields With Inner Hits. The problem is, when creating visualisations, like a Pie Chart for instance, the total entries are taken into account (14) and not my inner hit, which should be 13. In the nested case, documents are returned based on matches in nested inner objects. Will be fixed in future. The default depends in which query the inner hit is defined. We have a simple index Note: facets were replaced by aggregations: facets have been replaced by aggregations in Elasticsearch 1. Given the expense involved with nested mappings, Elasticsearch provides the following parameter settings to prevent performance problems: Index. 0, which are a superset of facets. So, I guess my question is - is that possible at all? Question in short: if I have an aggregation for a top_hits per bucket, how do I sum a specific value in the resulting structure? Details: I have a number of records that contain per store a certain Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This is verified to be a bug in elasticsearch 1. e. Would appreciate any help. As for the paging: When you have a SearchHits<T> object as the result of a query that use a Pageable, you can call. 8. Since I'm not returning the source and elastic has already done this I have a query that is very fast (sub-second) without any inner_hits, but takes 20 - 30 seconds with inner_hits returned. Then I need to search with specific queries. This feels the problem is that the performance aren't good enough. g we would like to ES to remove the commented out fields from the respo Is it possible to select inner hits objects from the snapshots (fields snapshots. 3. 0 and so far I can't make inner_hits work with a nested filter, although it works fine with a nested query. I have read some article, and it said i can use inner hits to return child and parent together. I have two child types: childA and childB. Note: It seems that sometimes the inner hits contains extra query names (from the other nested queries) in the matched_queries, so it may need some post-processing I'm fairly sure there are some performance degradations in 6. Elasticsearch: Return only nested inner_hits. See the Elasticsearch documentation on Inner hits for more detail. What I realize is that my nested object is empty however, the parent is being returned despite there being now match. Elasticsearch. hits,aggregations. 2. members field, which is just wrong (the hits cannot be empty, since then the entire document wouldn't be a hit): My query contains two has_child clauses as shown in the code snippet below. In our project we use Elasticsearch 5. 2. nested_fields. The problem I hit is that the terms aggregation that builds the grouping category buckets needs to know which nested category matched the search query. So i wrote the json query and it ran successfully. Since I used to return the nested data using inner hits, from the documentation using _source is not a best solution if we have large set of nested objects to return. I have a query that collapses on a field representing a hash that can at most be shared between two entries. Elasticsearch query nested object. as requested, sample document and expected result: Elasticsearch: Return only nested inner_hits. hits key, as an array of maps, each map in the array represent a hit, with its metadata. hits. dateTo AND snapshots. Let's say I want to retrieve the inner nested o I need to aggregate this inner_hits data. The inner hits feature returns per search hit in the search response additional nested hits that caused a search hit to match in a different scope. The query returns users which have certain privileges, but I would like to return the aggregated privilegeNames for each user for the privileges that match the has_child query. Soft deletes can only be configured at index creation and only on indices created on or after Elasticsearch 6. When working with Elasticsearch, there are times when you may want to remove hits from the response to reduce the amount of data returned or to focus on specific information. See Retrieve inner hits. 5. I have a parent-children mapping in ElasticSearch: parent: user children: privileges For privileges there are a few properties, and one is "privilegeName". This issue is certainly one. Currently you are not getting expected results because by default score_mode parameter is avg in nested query, so if 5 stores match the given product they might be scored lower than say one which matches 2 stores only because the _score is calculated by taking average. SearchHits<Entity> searchHits = operations. ou can check the source: https: In all cases I always have to increase Elasticsearch's "max_inner_result_window” configuration. It looks like the last inner hits overwrite first inner hits. Modified 4 years, 1 month ago. What you're showing here is how I originally expected to see inner_hits behave. But I WANT the inner hits to highlight lions, just as the doctext highlighting does. Or does it only improve performance under special circumstances? Elastic Docs › Elasticsearch Guide [7. Why am I not getting highlighting when my term query contains pointy brackets (<>)? Elasticsearch. However, when the query converted to NEST, it can't return the inner hits result. I have an index, which stores a nested document. Methods inherited from class java. x. I use this for my nested docs already, but it doesn't solve this problem because (1) it persists on inner hit level and (2) I want this to work with non-nested queries, too. I have wanted aggregation results without hit results, I think that's the spirit of Venkat's question. Maybe I should use aggregation? elasticsearch; Another way to keep using terms/top_hits is to leverage response filtering and only return what you need. If you're having inner_hits performance problems with nested objects, it's may also be worth trying stored fields on the nested object, as the documentation suggests. The following works: Multilingual instrument names flûte à bec should find music for recorder Generic instrument names violin should find music for viola d'amore but not vice versa Meta instruments "violin" should find The hits count given by Kibana at the top left is 14, but that is normal, as stated in the docs, that is the total hit count and not the inner hit. If you add a unique name to your inner_hits, then the result will basically contain a map of your inner hits as you're expecting. I wanna see this nested documents, for this purpose I used 'inner_hits' in request, but elastic returns nullPointerException. What I have observed is that I get only those child contents in the inner hit response that are part of second child clauses. thanks! Here is an example of the data structure that Elasticsearch returns. You can alternatively store explicitly in the mapping the few fields you want to retrieve and use stored_fields to only load them but not the This is verified to be a bug in elasticsearch 1. But I'm still not sure how and why this feature works. Not just the outer hits, and not just the inner hits within each outer hit. The structure looks like this: "<query>" : { "inner_hits" : { <inner_hits_options> } } Inner Hits is particularly useful when dealing with nested objects or parent-child relationships. I want to limit the size of the inner hits across all of the outer hits. This is the result of me getting the innerhits from a nested field called "attributes" I have for an index (after I need to understand how to potentially filter out those entries whereby following collapse the total is 1 and not 2, i. I would try removing the inner_hits from your request. However, I've noticed that inner_hits was not returning some blocks containing "cash". This problem can be solved by summing all the inner hits by Good Day: I'm using ElasticSearch/NEST to query against nested objects. So we have run into a problem related to a bit more complex scenario, where we have to filter search results by values from inner hits. 1] | Elastic mohitjain (Mohit Jain) December 20, 2016, 10:42am Elasticsearch flats the matching field so is unable to tell which was the actual element in the array that matches. I am aware that my Elasticsearch knowledge is currently limited. The feature inner_hits sounds very promising, but it just means that you can handle the hits inside nested documents independently to get a highlighting for each of them. While doing so, I am having some performance related queries. To be able to use field collapsing for grouping together project results, we need to insert a separate document for every child listing, and each of these must My preference goes to option A. g. I was expecting a performance To obtain this i can remove the inner_hits in the aggregations, the top_hits on the nested query or span queries in the functions scores. The original doc is under the key _source in each hit. I called that the inner hits, but I am not sure if this is correct. Defaults to true. To go back to my example, I might search for "text" and see the second and third blocks be returned as inner_hits, but not the first block. I have tried to use post filter but the inner_hits object is not available and hence the total can not be queried. x vs 5. I guess that's where the difference is coming from. The expansion of the group is done by sending an additional query for each inner_hit request for each collapsed hit returned in the response. consider performance when taking this approach as it is by magnitudes more expensive. Even if Elasticsearch does the same work either way, an empty hits array makes the response smaller. Here is the github link of the issue. ignore_unmapped is the way to handle this when needing inner_hits. Is this possible? Is this possible? For example, imagine I have the document "ferrari" with the tags red and car . I don't even know how to word this question properly so here's my best. I have a document with a nested field and I'm having some trouble getting highlighting to work. Inner hits can be used by defining an inner_hits definition on a nested, has_child or has_parent query and filter. They need to run the query again on specific documents to check which children matched. 4. dateFrom,snapshots. See nested aggregations: Nested Aggregation | Elasticsearch Guide [5. As an I'm using ES to search movements of baroque music, so someone can find e. I tried to change the inner_hits part of the query to How the inner hits should be sorted per inner_hits. Closed CSharpBender opened this issue May 5, 2020 · 3 comments so I made use of inner_hits to include in the response only the required nested document (1 out of 100). A global limit can be added and would just stop adding inner hits to search hits in the response if more than the specified time is time or more then the specified inner hits have been added. I am querying parents of childA like this There is an open issue about inner_hits. Discussed this at fix-it-friday and source computation can be much cheaper if take this into account when implementing #23917, so for now we shouldn't change the default here. It allows you to retrieve not only the matching nested or child documents but I recently upgraded from Elasticsearch 6 to 7 and stumbled across the 10000 hits limit. There was a possibility to filter those results after being returned from elastic, but this would impede functionality of our application (not even speaking of performance). This article will discuss various methods to remove hits from Elasticsearch response, including using the _source filtering, stored_fields parameter, and scripting. I am able to query, filter, and return back only matching jobs. But I can't get it to work - the _score turns NULL as soon as I use it in an script. Help would be highly appreciated! I tried using "nested" instead of "match" for the query, but that does not work: Thanks for your answer and for giving some examples. When I search for "apple OR banana OR water", I get the score only from the max inner hit score, but I want to get the score from the sum of the inner hit scores. The inner_hits do highlight those since we did not specify something else to do. Commented Jul 30, 2020 at 12:15. Is there any way to get both inner hits? Here is the query I used.
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