MongoDB Search and MongoDB Vector Search Changelog

30 April 2026 Release

• Adds preview support for $vectorSearch over arrays of embeddings and arrays of embedded documents containing vectors.

27 April 2026 Release

• Introduces the storedSource option for MongoDB Vector Search indexes to store source document fields with the index and return them in $vectorSearch results using returnStoredSource.

14 April 2026 Release

• Adds support for multi-select faceting to enable users to filter by multiple buckets within the same facet without recomputing counts for the other buckets in that facet.

07 April 2026 Release

• Adds preview support for flat indexes in MongoDB Vector Search via the flat value for the indexingMethod option. Flat indexes provide enhanced support for multitenant workloads, delivering improved performance, recall, and resource efficiency.

29 January 2026 Release

• Adds new MongoDB Search alerts and metrics for index field limits to prevent performance degradation and mongot instability, which over-indexing can cause:

  • Atlas Search: Max Number of Fields Indexed is

  • Atlas Search: Max Number of nGram Fields Indexed is

  To mitigate alerts, consider switching to static mapping, applying the attribute pattern for polymorphic schemas, and auditing nGram or autocomplete usage. To learn more, see Review MongoDB Search Metrics.

24 November 2025 Release

• Adds preview support for lexical prefilters for Vector Search with the addition of the vectorSearch operator and the vector index type. This allows you to filter documents by analyzed text capabilities such a fuzzy search, phrase matching, location filtering, wildcard pattern matching, and so on before performing vector similarity searches.

06 November 2025 Release

• Deduplicate storage cost for string fields indexed with multi.

• Fixes an issue with token field types when faceting on high cardinality fields.

• Supports $exists operator in the $vectorSearch pre-filter.

21 October 2025 Release

• Supports querying, filtering, and retrieving objects within arrays as individual documents using returnScope.

  • Adds hasRoot operator for querying root document fields when using returnScope.

  • Adds hasAncestor operator for querying higher-level or equal-level fields when using returnScope.

  • Supports storing nested fields in array of objects using storedSource for retrieval with returnStoredSource for queries using any operator.

25 September 2025 Release

• Adds support for configuring dynamic indexing with typeSets. To learn more, see Configure a typeSet.

• Starting with MongoDB 8.0.14, the returnStoredSource and scoreDetails options must be set to true or false. Queries that specify null for these options will fail.

• Adds support for specifying the stableTfl or boolean similarity algorithms when indexing string fields as the MongoDB Search string and autocomplete types. These algorithms are applied at query time to calculate MongoDB Search scores with the text, phrase, queryString, and autocomplete operators. To learn more, see Score Details.

• Supports setting the $ne operator to null in MongoDB Vector Search pre-filters.

22 September 2025 Release

• Improves highlight loading by always retrieving highlights from the base string field.

• Skips downloads of snapshots that exceed the configured age threshold.

• Updates blobstore credential handling to use the new refreshDate field instead of the deprecated expirationDate field.

• Adds a required memory usage metric.

10 July 2025 Release

• Adds support for new token filter types keywordRepeat and removeDuplicates for custom analyzers.

• Removes support for deprecated kp and lovins stemmers for the snowballStemming token filter type.

• Changes the german stemmer's handling of umlauts, so that the German letters ä, ö, and ü, are expanded to ae, oe, and ue, respectively.

• The german2 stemmer is now outdated.

25 June 2025 Release

• MongoDB v8.1 supports:

  • Creating search indexes on Views using mongosh and Driver methods.

  • Running $search, $searchMeta, and $vectorSearch queries against standard Views.

10 June 2025 Release

• Introduces structured JSON mongot logs.

• Adds the ability to facet on token types. stringFacet is still supported but is now outdated.

• Exposes the Hierarchical Navigable Small Worlds graph construction parameters for a MongoDB Vector Search index definition.

• Adds number of segments and per-segment statistics to MongoDB Vector Search explain output.

30 March 2025 Release

• Increases the vector dimension limit to 8192.

24 January 2025 Release

• Adds the ability to facet on number and date. numberFacet and dateFacet are still supported but are now outdated.

• Supports facet (MongoDB Search Operator) groupings on numbers and dates in arrays.

• Supports explain results for int8 and uint1 vector search queries.

09 December 2024 Release

• Supports explain for facet (MongoDB Search Operator) queries.

• Supports customizing the sort order of null and missing values. To learn more, see Syntax.

• Avoids deleting the index upon initialization errors.

02 December 2024 Release

• Supports scalar quantization feature to reduce the main memory requirements of vector search by around 75%.

• Supports binary quantization feature to reduce the main memory requirements of vector search by around 97%.

• Supports ingesting int1 vectors using the new BinData vector subtype.

• Supports ENN search using int8 and int1 subtypes.

18 October 2024 Release

• Fixes an issue that caused Search Nodes to crash when disk was full.

18 September 2024 Release

• Supports synonyms in phrase queries.

• Adds support for the matchCriteria field to the text operator.

• Changes the behavior of indexes with failed synonyms mapping so that queries which don't use the affected synonyms mapping can run successfully.

• Fixes a bug that caused consistency issues when using searchAfter or searchBefore with search nodes.

• Transitions indexes where the index objects limit is reached to a queryable STALE state.

• Supports indexing token types in embedded documents.

• Supports using the mongosh command or driver helper methods to create, retrieve, edit, or delete MongoDB Search indexes on M0, M2, or M5 Atlas clusters.

• Supports ingesting float32 and int8 vectors using the new BSON vector type.

19 August 2024 Release

• Supports pre-filtering using arrays with all operators.

• Supports using ObjectId with range operators in MongoDB Vector Search pre-filters.

• Supports using UUID values with all operators in MongoDB Vector Search pre-filters.

• Supports using the $not operator in MongoDB Vector Search pre-filters.

28 June 2024 Release

For MongoDB Search:

• Upgrades to Java 21.

  Java 21 supports SIMD, which increases the amount of parallelism the CPU can do during vector comparisons.

• Updates all indexes to support the sort option for number and date types.

• Automatically indexes null and UUID values if you enable dynamic mappings, which might increase the size of your index.

• Supports using the range operator and sort option with ObjectId types.

• Supports using the sort option with boolean values.

25 June 2024 Release

• Makes Search Nodes on Azure generally available for both your development and production deployments.

• Introduces Search Nodes support for multi-region and multi-cloud clusters as a Preview feature.

20 June 2024 Release

• Supports index creation on free (M0) and shared tiers (M2 and M5) by using MongoDB Drivers.

• Introduces exact flag in $vectorSearch to perform ENN search for small-scale, multi-tenant, or recall benchmarking use cases. To learn more, see Run Vector Search Queries.

14 June 2024 Release

• Supports pre-filtering your data by the objectId type.

31 May 2024 Release

• Introduces MongoDB Search Query Templates in the Search Tester, which makes querying easier with pre-written $search queries including conditional clauses like must and should, autocomplete for search-as-you-type experiences, faceting, and more. To learn more, see Define Your Query.

• Introduces changes to the MongoDB Search API endpoints. To learn more, see API Changelog for May 31 2024 Release.

10 May 2024 Release

• Truncates large stringFacet values.

• Supports pre-filtering data by date fields indexed as the filter type.

07 May 2024 Release

• Fixes an issue where MongoDB Search didn't include the _id field for some documents in the results when using returnStoredSource.

23 April 2024 Release

• Fixes an issue where MongoDB Search triggered spurious initial syncs after certain mongod configuration changes.

• Rebuilds indexes where the definition version is missing.

28 March 2024 Release

• Fixes an issue where MongoDB Search didn't generate results for searchAfter or searchBefore queries when scores were tied.

• Adds the ability to query and sort by null and UUID values.

27 March 2024 Release

• Updates MongoDB Vector Search queries to run concurrently by default on search nodes.

05 March 2024 Release

• Re-enables sort pruning.

• Includes synonym queries in explain().

• Increases the vector dimension limit to 4096.

01 March 2024 Release

• Fixes an issue where sharded Atlas clusters running MongoDB v7.2.0 would return an error for $searchMeta stages that contain the facet collector.

14 February 2024 Release

• Supports running $searchMeta queries in the Search Tester. To learn more, see Define Your Query.

17 January 2024 Release

• Supports retrieving $search results sequentially after or before a reference point, which you can specify using a token generated by the $meta keyword searchSequenceToken. To learn more, see Paginate the Results.

26 December 2023 Release

• Supports using equals, in, and range operators to perform exact matching and filtering on BSON strings indexed as the MongoDB Search token type.

04 December 2023 Release

• Makes separate Search Nodes for AWS generally available for both your development and production deployments. To learn more, see Node Architecture.

• Deprecates knnVector type and knnBeta operator. Instead, you can now use the new vectorSearch index type and the $vectorSearch pipeline stage in both your development and production deployments. To learn more, see MongoDB Vector Search Overview.

• Improves latency when there are no mixed types in the fields you use to sort the results.

• Introduces low-CPU search tiers.

• Makes $vectorSearch generally available for both your development and production deployments. Also makes separate Search Nodes for AWS generally available for both your development and production deployments. To learn more, see Node Architecture.

• Introduces vectorSearch index type that indexes vector embeddings as vector type for semantic search and boolean, numeric, and string data as filter type for pre-filtering.

23 October 2023 Release

• Introduces dedicated Search Nodes for MongoDB Search as a Preview feature. This feature and the corresponding documentation might change at any time during the Preview period. To learn more, see What is MongoDB Search?.

• Supports parallel queries across segments for dedicated search nodes to improve response times. To learn more, see Parallelize Query Execution Across Segments.

02 October 2023 Release

Introduces $vectorSearch to perform semantic search on data in your Atlas cluster running MongoDB 7.0.2.

To learn more, see MongoDB Vector Search Overview.

26 September 2023 Release

• Adds atlas deployments in the Atlas CLI so that you can work with Atlas Search and MongoDB Vector Search throughout the entire software development lifecycle from your local environment to the cloud. To learn more, see Manage Local and Cloud Deployments from the Atlas CLI.

• Supports implicitly and explicitly sorting results by score.

13 September 2023 Release

• Supports custom analyzer configuration in the Atlas UI Visual Editor.

• Supports token type configuration in the Atlas UI Visual Editor.

30 August 2023 Release

• Performs system upgrade. You might notice some indexing and querying performance changes.

31 July 2023 Release

• Supports highlighting for fields if the fields are indexed under a parent field of type document for query predicates specified inside the embeddedDocument operator.

• Starts initial sync automatically in certain scenarios with sharding.

• Fixes a bug that caused changes to token field mapping to be ignored.

10 July 2023 Release

• Adds the sort option, which supports sorting in ascending or descending order on fields that you define in your MongoDB Search index for sorting.

  Note

  MongoDB Search sort option is available in sharded clusters only if you run MongoDB v6.0+.

• Limits the knnBeta operator as a top-level operator.

• Introduces the ability to perform text, wildcard, regular expression, fuzzy, and range searches on string fields by using the queryString operator.

• Improves performance of $search with $limit.

• For Atlas clusters running MongoDB 6.0.8 or later on M10 or higher clusters, introduces ability to create and manage MongoDB Search indexes from mongosh and NodeJS driver.

  Note

  This release does not allow using the mongosh command or driver helper methods to create, retrieve, edit, or delete MongoDB Search indexes on M0, M2, or M5 Atlas clusters.

22 June 2023 Release

• Provides preview of vector search to store, index, and query vectors using MongoDB Search.

14 June 2023 Release

• Adds support for restoring MongoDB Search indexes from Cloud Backup snapshots of M10 or larger clusters.

07 June 2023 Release

• Supports tracking search terms in queries and viewing query analytics for tracked search terms in the Atlas UI for M10 or higher Atlas clusters.

26 May 2023 Release

• Adds the in operator, which performs a search for an array of values and returns documents where the value of the field equals any value in the specified array.

• Changes the operator option of the facet collector to be optional. facet queries that you specify without an operator run over all indexed documents.

25 April 2023 Release

• Adds scoreDetails boolean option to retrieve a detailed breakdown of the score for each document in the query results.

01 March 2023 Release

• Introduces the ability to edit your MongoDB Search query in the Search Tester.

31 January 2023 Release

• Adds the following language analyzers:

  • lucene.polish

  • lucene.portuguese

  • lucene.smartcn

  • lucene.sorani

  • lucene.thai

  • lucene.turkish

• Adds the following token filters:

  • englishPossessive

  • flattenGraph

  • kStemming

  • porterStemming

  • spanishPluralStemming

  • stempel

  • wordDelimiterGraph

• Supports the number data type using the equals operator.

• Supports synonyms for sharded clusters.

25 January 2023 Release

• Supports the embeddedDocuments type in the MongoDB Search visual editor configuration mode in the Atlas UI.

02 November 2022 Release

• Supports statically indexing arrays of strings as the autocomplete type and querying the indexed field using the autocomplete operator.

• Supports dynamically and statically indexing numbers in arrays and querying the indexed numbers in arrays using the range operator only.

• Supports dynamically and statically indexing dates in arrays and querying the indexed dates in arrays using the range operator only.

• Supports dynamically and statically indexing objectIds and arrays of objectIds and querying the indexed objectIds using the equals operator.

• Supports dynamically and statically indexing booleans and arrays of booleans and querying the booleans using the equals operator.

03 October 2022 Release

• Improves performance for storedSource.

02 August 2022 Release

• Upgrades to MongoDB Search, which include the following:

  • Querying improvements

    • Supports \w, \W, \D, \s, and \S regular expressions in the regex query. However, MongoDB Search doesn't return results for characters other than s, S, w, W, d, and D in the regex query. We recommend using backslashes according to regex standards.

    • Updates to email tokenizer top-level domains from the IANA Root Zone Database.

  • Highlighting improvements

    • Passage selector truncates long snippets to show a shorter snippet, which fixes the cause for queries failing when the passage is long.

  • Explain output for some queries might look different. If you use explain, verify that the changes don't break logic in your environment.

  In addition to the preceding list of changes, you might notice some indexing and querying performance changes.

• Introduces moreLikeThis operator to retrieve documents similar to one or more input documents.

07 June 2022 Release

• Supports the facet collector on sharded clusters running MongoDB 6.0 and later.

• Supports $search and $searchMeta stages inside $lookup and $unionWith sub-pipeline.

01 June 2022 Release

• Introduces embedded documents for $elemMatch-like searches.

27 April 2022 Release

• Improves performance of stored source fields for faster post-aggregation stages.

• Improves precision of replication lag metrics reporting.

19 April 2022 Release

• Optimizes internal batching to improve stored source query performance when your query matches a large number of documents (5,000 or more).

31 March 2022 Release

• Introduces an option in the index definition for storing fields on MongoDB Search and $search option for returning stored fields.

09 March 2022 Release

• Introduces a new Project Search Index Editor role to create, view, edit, and delete MongoDB Search indexes using the Atlas UI or API.

• Serves queries using your last valid index if new index definition is invalid.

• Removes Lucene's default clause limit of 1024 for BooleanQuery on dedicated clusters.

  Note

  We are extending support for faceting on numeric and date fields using the number and date types from August to September 2022. You must migrate to the numberFacet and dateFacet types in all index definitions for faceting on numeric and date fields, respectively.

01 March 2022 Release

• Adds the numberFacet and dateFacet data types for running facet queries on number and date fields respectively.

  Note

  We are extending support for faceting on numeric and date fields using the number and date types from August to September 2022. You must migrate to the numberFacet and dateFacet types in all index definitions for faceting on numeric and date fields, respectively.

26 January 2022 Release

• Adds reverse token filter, which reverses each string token.

10 December 2021 Release

• Adds support for Gaussian decay expressions, which decay, or reduce, document scores by multiplying at a specified rate.

03 November 2021 Release

• Adds asciiFolding token filter for converting alphabetic, numeric, and symbolic unicode characters that are not in the Basic Latin Unicode block to their ASCII equivalents.

28 September 2021 Release

Autocomplete improvements in this release:

• Adds support for analyzers in the index definition for autocomplete.

• Boosts exact matches in autocomplete operator.

• Adds rightEdgeGram tokenization strategy to create edgeGram-like tokens starting at the right side of words (instead of the left side).

Bug fixes in this release:

• Fixes objectId highlighting error.

07 Septermber 2021 Release

• Allows indexes to enter a recovering state and remain available after encountering certain replication errors.

13 July 2021 Release

• Adds support for synonyms, which can be defined in a source collection and mapped to search indexes via the Atlas API.

01 June 2021 Release

• Supports wildcard path for highlight.

05 April 2021 Release

• Adds stopword token filter for removing tokens that match the specified stop words.

19 March 2021 Release

• Adds additional language analyzers, token filters, and tokenizers.

• Adds support for function scores, which allows you to alter the relevance score of a document using a numeric field in the same document.

05 February 2021 Release

• Supports explain for $search queries.

16 January 2021 Release

• Fixes an issue with highlighting raising errors when combined with ObjectID equality operators.

14 January 2021 Release

• Improves performance of initial sync indexing.

15 December 2020 Release

• Adds maxNumPassages and maxCharsToExamine for highlight.

19 November 2020 Release

• Improves performance of steady state indexing.

13 November 2020 Release

• Fixes a bug in custom analyzers where only the first charMap character filter was being executed.

1 October 2020 Release

• Removes downtime requirement when rebuilding modified index definitions.

2 September 2020 Release

• Adds custom analyzers for index definitions and search queries.

23 August 2020 Release

• Adds support for wildcard path.

9 June 2020 Release

• Releases Atlas Search to general availability.

• Adds support for data types boolean and objectId.

18 May 2020 Release

• Adds a new index option to exclude the norms field, allowing a search index to ignore field length when scoring search results.

• Adds the tokenOrder option to the autocomplete operator, supporting unordered terms in search queries.

• Improves error messages to facilitate query debugging, including eliminating stack traces and other Java-specific messages.

30 April 2020 Release

• Adds support for geospatial queries, including:

  • A new geo data type for indexing geographic point and shape coordinates.

  • Two new operators, geoWithin and geoShape, to support queries on geospatial data, such as points and polygons.

• Adds autocomplete features to support better search-as-you-type functionality, including:

  • A new autocomplete operator and index type.

  • Analyzer-agnostic diacritic folding of field values.

  • Scoring options, such as boost and constant.

  • Compound queries that combine autocomplete with other $search operators.

  • n-grams/shingles and edge n-grams from analyzed text.