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fix(mcp): handle Neo4j 5.x index creation race condition #1081

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fix(mcp): handle Neo4j 5.x index creation race condition #1081

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14 changes: 12 additions & 2 deletions mcp_server/src/graphiti_mcp_server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -278,8 +278,18 @@ async def initialize(self) -> None:
# Re-raise other errors
raise

# Build indices
await self.client.build_indices_and_constraints()
# Build indices - wrap in try/except to handle Neo4j 5.x race condition
# with parallel IF NOT EXISTS index creation
try:
await self.client.build_indices_and_constraints()
except Exception as idx_error:
if 'EquivalentSchemaRuleAlreadyExists' in str(idx_error):
logger.warning(
'Index creation race condition detected (Neo4j 5.x issue). '
'Indexes likely already exist. Continuing...'
)
else:
raise

logger.info('Successfully initialized Graphiti client')

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