Meilisearch v1.54.2 contains an important fix for users of the dynamicSearchRule experimental feature.

• Trying to process, display, delete or cancel dynamic search rules update tasks that were created in Meilisearch v1.53 or prior no longer causes internal errors. By @dureuill in https://github.com/meilisearch/meilisearch/pull/6651. Thanks to @connorabbas for their report in https://github.com/meilisearch/meilisearch/issues/6646 ❤️

• Make the embedder setting change succeed when the embedder's API key is expired by @ManyTheFish in https://github.com/meilisearch/meilisearch/pull/6640
• Ignore geo errors when updating or deleting existing docs by @dureuill in https://github.com/meilisearch/meilisearch/pull/6638

• Aggregate the analytics from the MCP route by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6639

Meilisearch v1.54.0 makes breaking changes to the dynamicSearchRules experimental features.

• For Cloud users, rules will be migrated automatically, and the UI will adapt to the new API. Only the first change on rulelist might affect users that directly get rules through the API.
• If upgrading with --upgrade-db, rules will be migrated automatically.

1. The POST /dynamic-search-rules endpoint now returns actions as an object with 2 fields instead of a list:

2. pin is an array of Pin objects with the following fields:

   1. id, String, mandatory: document id of the document to pin
   2. position: positive or zero number, mandatory: position where to pin the document
   3. indexUid, optional, defaults to null, uid of the index that this action applies to. If null or missing, the action applies to any index containing a document with the provided id.

3. scale is an array of Scale objects with the following fields:

   1. weight, positive or zero number, mandatory: scaling factor to multiply with the selected documents' innate relevancy score
   2. ids, array of strings, optional: list of document ids whose document's relevancy score should be scaled by the provided weight
   3. filter: Meilisearch filter without a foreign filter, optional: a filter on the index that is resolved to determine a list of selected documents
   4. indexUid, optional, defaults to null, uid of the index that this action applies to. If null or missing, the action applies to any index.

4. The PATCH /dynamic-search-rules/{:ruleUid} endpoint now expects a rule with the modified actions field. See changes to POST /dynamic-search-rules for details.

5. The uid __meilisearch_metadata is now reserved and cannot be used as a ruleUid in PATCH /dynamic-search-rules/{:ruleUid}

• A dynamic search rule can now boost, deboost or hide documents by defining a new "scale" action that selects some documents by filter and/or an explicit list of ids and exposes a scale factor as a weight:
  • If the weight is > 1.0, then the selected documents are boosted
  • If the weight is < 1.0, then the selected documents are deboosted (demoted)
  • If the weight is = 0.0, then the selected documents are hidden and don't appear in search results (unless if they are also pinned)
  • ⚠️ Because the factor is applied to the relevancy rules, it has little measurable effect when the first ranking rule is not a relevancy rule.
• Score details for a pinned document now contains an additional ruleUid field indicating the name of the rule that resulted in the document being pinned. ⚠️ As a result, end-users can find out the uid of applied rules by looking at ranking score details. Please keep any sensitive information in the description of the rule instead ⚠️
• Score details for a scaled document now contains an additional scale field, with order 0. The scale field is an object with the following fields:
  • order: order of application of the rule. Always 0
  • actions: an array of ScaleActions, where each ScaleAction contains the following fields:
    • ruleUid: the name of the rule that was applied
    • weight the weight of the rule that was applied
  • totalWeight: the total multiplicative factor computed as the product of the individual .actions[].weight.
• New environment variables controlling how much scale operations can occur:
  • MEILI_EXPERIMENTAL_DSR_FUEL_MAX_SCALE_ACTIONS: maximum number of applicable (at least one selected document) scale actions in a single search. Range 1-255, default 10
  • MEILI_EXPERIMENTAL_DSR_FUEL_SCALE_FUEL: maximum number of combinations of scale constraint that are evaluated in a single search. Range 1-255, default 10.

// PATCH /dynamic-search-rule/batman-festival

{
  "conditions": {
    "time": {
      "start": "2026-09-21T19:00:00Z",
      "end": "2026-09-28T18:59:00Z"
    },
  },
  "actions": {
    "scale": [
      {
        "filter": "series = batman",
        "weight": 4.0
      }
    ]
  }
}

{
  "q": "superhero returns prequel",
  "showRankingScoreDetails": true
}

"hits": [
        {
          "id": "batman-returns",
          "title": "Batman Returns",
          "series": "batman",
          "_rankingScore": 0.30808080808080807,
          "_rankingScoreDetails": {
            "scale": {
              "order": 0,
              "actions": [
                {
                  "ruleUid": "batman-festival",
                  "weight": 4.0
                }
              ],
              "totalWeight": 4.0
            },
            "words": {
              "order": 1,
              "matchingWords": 1,
              "maxMatchingWords": 3,
              "score": 0.3333333333333333
            },
            "typo": {
              "order": 2,
              "typoCount": 0,
              "maxTypoCount": 1,
              "score": 1.0
            },
            "proximity": {
              "order": 3,
              "score": 1.0
            },
            "attributeRank": {
              "order": 4,
              "score": 1.0
            },
            "wordPosition": {
              "order": 5,
              "score": 0.9090909090909092
            },
            "exactness": {
              "order": 6,
              "matchType": "noExactMatch",
              "matchingWords": 1,
              "maxMatchingWords": 1,
              "score": 0.3333333333333333
            }
          }
        },
        {
          "id": "superman-returns",
          "series": "superman",
          "title": "Superman Returns - The Prequels",
          "_rankingScore": 0.9628456221198156,
          "_rankingScoreDetails": {
            "words": {
              "order": 0,
              "matchingWords": 3,
              "maxMatchingWords": 3,
              "score": 1.0
            },
            "typo": {
              "order": 1,
              "typoCount": 0,
              "maxTypoCount": 3,
              "score": 1.0
            },
            "proximity": {
              "order": 2,
              "score": 0.5714285714285714
            },
            "attributeRank": {
              "order": 3,
              "score": 1.0
            },
            "wordPosition": {
              "order": 4,
              "score": 0.9032258064516128
            },
            "exactness": {
              "order": 5,
              "matchType": "noExactMatch",
              "matchingWords": 2,
              "maxMatchingWords": 3,
              "score": 0.25
            }
          }
        },
        // ...
      ],
      "processingTimeMs": "[duration]",
      "limit": 20,
      "offset": 0,
      "estimatedTotalHits": 42,
      "requestUid": "[uuid]"
    }

// PATCH /dynamic-search-rules/out-of-stock

{
  "actions": {
    "scale": [
      {
        "filter": "availability = \"out of stock\"",
        "weight": 0.5
      }
    ]
  }
}

// PATCH /dynamic-search-rules/discontinued

{
  "actions": {
    "scale": [
      {
        "filter": "availability = discontinued",
        "weight": 0.0
      }
    ]
  }
}

By @dureuill in https://github.com/meilisearch/meilisearch/pull/6549

We introduce a new MCP protocol on the /mcp path. It implements the HTTP+SSE Transport version of the protocol. You can register the Meilisearch MCP in your favorite LLM, e.g., Claude Code, Codex. Note that the MCP route is using bearer authentication and doesn't support OAuth authentication.

Enable the mcpRoute experimental feature to use the feature.

by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6629

The performance details in a federated search now separate the timing per query

"performanceDetails": {
  "wait in queue": "1.36ms",
  "preprocess filters > prepare": "985.00µs",
  "preprocess filters > send to remote": "220.00µs",
  "preprocess filters > execute local > evaluate filter": "139.00µs",
  "preprocess filters > execute local": "1.61ms",
  "preprocess filters > wait for remote": "35.97ms",
  "preprocess filters": "39.01ms",
  "process > prepare": "96.00µs",
  "process > send to remote": "118.00µs",
  "process > execute local > load field ids map": "63.00µs",
  "process > execute local > query[0] > evaluate filter": "84.00µs",
  "process > execute local > query[0] > tokenize query": "163.00µs",
  "process > execute local > query[0] > evaluate query": "116.00µs",
  "process > execute local > query[0] > keyword ranking": "634.00µs",
  "process > execute local > query[0]": "1.52ms",
  "process > execute local > pin hits": "29.00µs",
  "process > execute local > format": "36.00µs",
  "process > execute local": "2.90ms",
  "process > wait for remote": "37.24ms",
  "process > merge": "82.00µs",
  "process": "40.45ms",
  "hydrate > send to remote": "38.00µs",
  "hydrate > execute local": "35.00µs",
  "hydrate > wait for remote": "41.00µs",
  "hydrate": "295.00µs",
  "merge facets": "51.00µs"
}

By @ManyTheFish in https://github.com/meilisearch/meilisearch/pull/6631

• Remove HashMap transmute in indexer by @dureuill in https://github.com/meilisearch/meilisearch/pull/6622
• Bump lru to 0.18.4 by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6633
• Simplify Rust install and update Rust to v1.98.1 by @dureuill in https://github.com/meilisearch/meilisearch/pull/6601
• Bump most dependencies by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6589
• Bump actions/setup-go from 6.5.0 to 7.0.0 by @dependabot[bot] in https://github.com/meilisearch/meilisearch/pull/6611
• Fix grammar and broken Markdown links in error code descriptions by @curquiza in https://github.com/meilisearch/meilisearch/pull/6626
• Fix typo by @simpleqt in https://github.com/meilisearch/meilisearch/pull/6619

• @simpleqt made their first contribution in https://github.com/meilisearch/meilisearch/pull/6619

Full Changelog: https://github.com/meilisearch/meilisearch/compare/v1.53.2...v1.54.0

• Remove 100ms penalty on task replication by @dureuill in https://github.com/meilisearch/meilisearch/pull/6612
• Do not hilight stop-words by @harismuzaffer in https://github.com/meilisearch/meilisearch/pull/6595
• Include last indexed documents in exactness ranking rule when updating searchable attributes in settings by @harismuzaffer in https://github.com/meilisearch/meilisearch/pull/6604

• Tie authorization to index opening by @ManyTheFish in https://github.com/meilisearch/meilisearch/pull/6610

• Add context for CorruptedTaskQueue error in message by @ManyTheFish in https://github.com/meilisearch/meilisearch/pull/6615
• Allow generating a description for the error codes by @dureuill in https://github.com/meilisearch/meilisearch/pull/6609
• Update charabia to 0.10.0 by @dureuill in https://github.com/meilisearch/meilisearch/pull/6602
• Fix typo by @vaibhav8a in https://github.com/meilisearch/meilisearch/pull/6605

• @harismuzaffer made their first contribution in https://github.com/meilisearch/meilisearch/pull/6595
• @vaibhav8a made their first contribution in https://github.com/meilisearch/meilisearch/pull/6605

Full Changelog: https://github.com/meilisearch/meilisearch/compare/v1.53.1...v1.53.2

by @ManyTheFish in https://github.com/meilisearch/meilisearch/pull/6587

Control the maximum number of LMDB read transactions at the same time for the task queue.

The following environment variable can be exported to specify the maximum number of simultaneous read transactions:

# Only the environment variable can set this parameter
MEILI_EXPERIMENTAL_TASK_QUEUE_MAX_READERS=100

Product discussion: https://github.com/orgs/meilisearch/discussions/806

• Bump mini-dashboard to v0.4.2 by @Strift in https://github.com/meilisearch/meilisearch/pull/6585

Full Changelog: https://github.com/meilisearch/meilisearch/compare/v1.53.0...v1.53.1

• Revert the Speed up the search speed a bit more by @Kerollmops introduced in https://github.com/meilisearch/meilisearch/pull/6542

Full Changelog: https://github.com/meilisearch/meilisearch/compare/v1.52.2...v1.52.3

• Revert the /tasks/stream and /batches/stream SSE routes by @Kerollmops introduced in https://github.com/meilisearch/meilisearch/pull/6533

Full Changelog: https://github.com/meilisearch/meilisearch/compare/v1.52.1...v1.52.2

• Make the health route checks blocking by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6583
• Revert some search progress traces by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6584

Full Changelog: https://github.com/meilisearch/meilisearch/compare/v1.52.0...v1.52.1

• Sharding for foreign filters by @ManyTheFish in https://github.com/meilisearch/meilisearch/pull/6517

  • The foreign filter now supports sharding by retrieving the documents through the network when evaluating the foreign filters and hydrating the documents.

  • The limit of documents that a foreign filter can retrieve has been increased from 100 to 1000.

• Adds indexSize and usedIndexSize returned by GET /indexes/{index_uid}/stats and in GET /stats by @tpayet in https://github.com/meilisearch/meilisearch/pull/6563

• Fix code security issues in GitHub Actions workflows by @curquiza in https://github.com/meilisearch/meilisearch/pull/6565
• Bump quinn-proto from 0.11.14 to 0.11.16 by @dependabot[bot] in https://github.com/meilisearch/meilisearch/pull/6538

• Bump peter-evans/repository-dispatch from 3.0.0 to 4.0.1 by @dependabot[bot] in https://github.com/meilisearch/meilisearch/pull/6556

Full Changelog: https://github.com/meilisearch/meilisearch/compare/v1.51.0...v1.53.0

• Introduce the /tasks/stream and /batches/stream SSE routes by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6533 This experimental feature allows establishing a live connection to the engine, avoiding the need to implement long polling and instead letting the engine provide new tasks, batches, and batch progress in a push-based manner. Using this route can drastically reduce network load when retrieving the status of a Meilisearch instance.
• Speed up the search speed a bit more by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6542 We improve the search speed when it comes to formatting the documents by making an O(n) operation, where n is the number of retrieved documents, become an O(1) operation. This improvement can significantly increase search speed when requesting a large (> 20) number of documents.

• Fix duplicate pins in federated search by @dureuill in https://github.com/meilisearch/meilisearch/pull/6543
• Skip the settings when nothing changes by @Kerollmops in https://github.com/meilisearch/meilisearch/pull/6544