Fixes#1079
Neo4j 5.26+ throws EquivalentSchemaRuleAlreadyExists errors when
creating indices in parallel, even with IF NOT EXISTS clause.
This fix:
- Catches neo4j.exceptions.ClientError exceptions
- Checks for EquivalentSchemaRuleAlreadyExists error code
- Logs the occurrence as info instead of error
- Returns empty result to indicate success (index/constraint exists)
This prevents the MCP server from crashing on startup when multiple
CREATE INDEX IF NOT EXISTS queries run concurrently via semaphore_gather.
The solution follows the same pattern already implemented in the
FalkorDB driver for handling "already indexed" errors.
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Co-Authored-By: Claude <noreply@anthropic.com>
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