ExactNearestNeighbor(name: Optional[str] = None, index_type: str = 'exactnearestneighbor', distance_strategy: llama_index_cloud_sql_pg.indexes.DistanceStrategy = <factory>, partial_indexes: Optional[list[str]] = None)ExactNearestNeighbor(name: Optional[str] = None, index_type: str = 'exactnearestneighbor', distance_strategy: llama_index_cloud_sql_pg.indexes.DistanceStrategy =