apoc.schema.relationship.indexExists
Function

This function is not considered safe to run from multiple threads. It is therefore not supported by the parallel runtime. For more information, see the Cypher Manual → Parallel runtime.
Prior to the release of APOC 2025.07, this function was restricted on on-premise instances. To use it on an older version, it must be unrestricted. For more details, see Installation → Load and unrestrict.

Details
Syntax	`apoc.schema.relationship.indexExists(type, propertyName)`
Description	Returns a `BOOLEAN` depending on whether or not an index exists for the given `RELATIONSHIP` type with the given property names.
Arguments	Name	Type	Description
	`type`	`STRING`	The relationship type to check for an index on.
	`propertyName`	`LIST<STRING>`	The property names to check for an index on.
Returns	`BOOLEAN`

apoc.schema.relationship.indexExistsFunction