ExecutionGraphCache cachedExecutionGraphs not cleanup cause OOM Bug

class org.apache.flink.runtime.rest.handler.legacy.ExecutionGraphCache will cache job execution graph in field 

"cachedExecutionGraphs" when call method 

"getExecutionGraph", but never call it's 

cleanup method in flink. it's cause JobManager Out of Memory, When submit a lot of batch job and fetch these job's info. becasue these operation cache all these job execution graph and "cleanup" method never called