Azure Cosmos DB
An Azure NoSQL database service for app development.
Hi Kalyan,
Using Mongo vcore, is not supported for this.
I have CosmosDB Vector Vcore - M30 (Cluster tier), Need to Enable Full text search BM25
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Kalyan
0
Reputation points
Request: Enable Azure DocumentDB full-text search with BM25 ranking (gated preview) on our cluster. Current behavior: $search only supports cosmosSearch / knnBeta; $search: { text: ... } fails with “Unrecognized $search option: text…”. Goal: Use BM25 lexical ranking + hybrid search (vector + lexical) in aggregation pipelines. Cluster: <cluster/account name>, RG: <resource group>, Subscription: <sub id>, Region: <region>, MongoDB version: 8.0. Use case: We store document chunks (field text) and embeddings (embedding 1536 dims) and need high-quality lexical relevance + hybrid retrieval for Q&A / summarization. Docs reference: DocumentDB full-text / hybrid search limitation notes BM25 ranking is gated preview.
Azure Cosmos DB
2 answers
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Manoj Kumar Boyini 6,575 Reputation points Microsoft External Staff Moderator2026-01-18T11:27:31.5266667+00:00 -
Khelan Modi 0 Reputation points Microsoft Employee2026-02-04T16:28:04.5666667+00:00 I wanted to jump in with a quick update: I’m the PM leading our Search initiative at Azure DocumentDB. We’re currently finalizing native BM25 support to help improve search relevance, and we expect it to be ready next month.
If you have questions about how this, please let me know!
Thanks,
Khelan-
Manoj Kumar Boyini 6,575 Reputation points Microsoft External Staff Moderator
2026-02-06T00:09:14.7566667+00:00 Hi Kalyan
I hope you had a chance to review the information shared earlier, and I hope this information has been helpful! If you still have questions, please let us know what is needed in the comments so the question can be answered.
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