[docs] Update couchbase provider, vector store & features list

[nithishr]

Description:

• Add filter documentation to the CouchbaseSearchVectorStore example.
• Update the docs for the Couchbase Provider to add examples & API reference
• Update the incorrectly set fields for Couchbase Vector Store
  • Search By Vector: https://couchbase-ecosystem.github.io/langchain-couchbase/langchain_couchbase.html#langchain_couchbase.vectorstores.search_vector_store.CouchbaseSearchVectorStore.similarity_search_by_vector
  • IDs in Document Add: https://couchbase-ecosystem.github.io/langchain-couchbase/langchain_couchbase.html#langchain_couchbase.vectorstores.base_vector_store.BaseCouchbaseVectorStore.add_texts
  • Multi Tenancy: Scopes & Collections provide multitenancy in Couchbase
  • Tests: Integration Tests in CI run every day + on every PR: https://github.com/Couchbase-Ecosystem/langchain-couchbase/blob/main/.github/workflows/_integration_test.yml

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 26, 2025 5:19pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #31719 will not alter performance

_{Comparing nithishr:update_couchbase_docs (c81f6ac) with master (8377490)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #31719 will not alter performance

_{Comparing nithishr:update_couchbase_docs (c81f6ac) with master (8377490)}

Summary

✅ 14 untouched benchmarks

[ccurme]

I don't see langchain-tests in package dependencies here, can you share a link to the tests?

[nithishr]

We are not using the langchain-tests for the integration tests. It is similar in the idea.

• Tests: https://github.com/Couchbase-Ecosystem/langchain-couchbase/blob/main/tests/integration_tests/test_search_vector_store.py
• Daily Test Run (Github Actions): https://github.com/Couchbase-Ecosystem/langchain-couchbase/actions/runs/15896467858

I can change the parameter value for passesStandardTests if that is a requirement until we refactor the tests to use the package.