SearchServiceImpl ERROR Elasticsearch index thread pool is overloaded message may appear in nexus.log

2017-06-21 13:32:18,011+0200 ERROR [event-5-thread-196] admin org.sonatype.nexus.repository.search.SearchServiceImpl - failed to add component c0ac2ab6c5e93a4adf888fac38692226 to index 3775d91831f0772efcb39b18617455a7fffa670f; this is a sign that the Elasticsearch index thread pool is overloaded 
org.elasticsearch.transport.RemoteTransportException: [4FAF27F9-1A68783F-CAD36F65-ED6BFACD-5B292BE3][local[1]][indices:data/write/index[p]] 
Caused by: org.elasticsearch.common.util.concurrent.EsRejectedExecutionException: rejected execution of org.elasticsearch.transport.TransportService$4@797ddb1c on EsThreadPoolExecutor[index, queue capacity = 200, org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor@524e8c87[Running, pool size = 8, active threads = 8, queued tasks = 200, completed tasks = 5888]]