CQL search throws error "Exception executing cql as async search"

https://<instance>/wiki/rest/api/search?limit=1000&cql=parent=xxxxxxxx

com.atlassian.confluence.api.service.exceptions.ServiceException: Exception executing cql as async search: parent=xxxxxxxxx

Caused by: org.elasticsearch.ElasticsearchException: too_many_clauses:too_many_clauses: maxClauseCount is set to 1024
com.atlassian.confluence.impl.search.elasticsearch.rest.ResponseErrorParser.handleOtherException(ResponseErrorParser.java:113)
com.atlassian.confluence.impl.search.elasticsearch.rest.ResponseErrorParser.parseErrorResponse(ResponseErrorParser.java:61)
com.atlassian.confluence.impl.search.elasticsearch.rest.ResponseErrorParser.handleShardSearchFailure(ResponseErrorParser.java:93)
com.atlassian.confluence.impl.search.elasticsearch.rest.ResponseErrorParser.lambda$handleShardSearchFailures$0(ResponseErrorParser.java:88)
java.lang.Iterable.forEach(Iterable.java:75)
com.atlassian.confluence.impl.search.elasticsearch.rest.ResponseErrorParser.handleShardSearchFailures(ResponseErrorParser.java:88)
... 42 more	
  	}	
  	 ext:	{	[+]	
  	}	
  	 hostname:	 dde06fed3820	
  	 level:	 WARN	
  	 logger:	 com.atlassian.confluence.rest.api.model.ExceptionConverter	
  	 m:	{	[+]	
  	}	
  	 message:	 Could not map exception type com.atlassian.confluence.api.service.exceptions.ServiceException to a specific REST status. Defaulting to InternalServerError	
  	 micros_container:	 confluence	
  	 product:	 confluence	
  	 thread:	 http-bio-8081-exec-60 [tenantId:xxxxxxxxxxxxxxxx] [traceId:00cf48a5c560cd7f]	
  	 time:	 2019-08-20T12:10:59Z	
  	 timestamp:	 2019-08-20T12:10:59.410