feat: add ability to create atlas search indexes

[nirinchev]

Proposed changes

This adds support for creating atlas search indexes. Dropping and listing is already supported, so needed no changes.

[Copilot]

Pull Request Overview

This PR adds support for creating Atlas Search (lexical) indexes through the MCP server. The changes enable users to create Atlas Search indexes with both dynamic and explicit field mappings, complementing the existing support for listing and dropping search indexes.

Key changes:

• Added Atlas Search index creation support to create-index tool with comprehensive schema validation
• Enhanced testing to differentiate between search and vector search indexes
• Added accuracy tests for various Atlas Search index creation scenarios

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/tools/mongodb/create/createIndex.ts	Adds atlasSearchIndexDefinition schema and implements search index creation logic
tests/integration/tools/mongodb/create/createIndex.test.ts	Adds comprehensive integration tests for Atlas Search index creation scenarios
tests/integration/tools/mongodb/delete/dropIndex.test.ts	Refactors tests to handle both search and vector search indexes separately
tests/accuracy/createIndex.test.ts	Adds accuracy test cases for Atlas Search index creation with various configurations
tests/accuracy/sdk/accuracyTestingClient.ts	Removes deprecated --connectionString flag from CLI arguments
README.md	Updates documentation to remove deprecated --connectionString flag

Comments suppressed due to low confidence (1)

tests/integration/tools/mongodb/create/createIndex.test.ts:1

• The index names are being evaluated at test definition time rather than test execution time. If getSearchIndexName() and getVectorIndexName() depend on beforeEach setup, these calls will execute before the setup runs, potentially returning undefined or stale values. Wrap these in functions: { description: "search", indexName: () => getSearchIndexName() } and update the test to call the function.

import { describeWithMongoDB, validateAutoConnectBehavior, waitUntilSearchIsReady } from "../mongodbHelpers.js";

[coveralls]

Pull Request Test Coverage Report for Build 18872159746

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 140 of 140 (100.0%) changed or added relevant lines in 1 file are covered.
• 57 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.3%) to 80.38%

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Files with Coverage Reduction	New Missed Lines	%
src/tools/mongodb/read/aggregate.ts	26	88.72%
src/common/search/vectorSearchEmbeddingsManager.ts	31	81.79%

Totals
Change from base Build 18847594160:	0.3%
Covered Lines:	6435
Relevant Lines:	7861

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💛 - Coveralls

[nirinchev]

This is best viewed with the "Hide whitespace" option - it's just prettier reformatting the indents.

[nirinchev]

--connectionString is deprecated so using the positional argument.