I am seeing following error in Kibana while accessing the dashboard. Due to this error one of the Visualization is not getting rendered.
Error: Request to Elasticsearch failed: {"error":{"root_cause":[],"type":"search_phase_execution_exception","reason":"","phase":"fetch","grouped":true,"failed_shards":[],"caused_by":{"type":"es_rejected_execution_exception","reason":"rejected execution of org.elasticsearch.action.search.FetchSearchPhase$1@50a80e55 on EsThreadPoolExecutor[search, queue capacity = 1000, org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor@5407c1e8[Running, pool size = 7, active threads = 7, queued tasks = 999, completed tasks = 61384820]]"}},"status":503}
at http://X.X.X.X:5601/bundles/kibana.bundle.js?v=15063:237:1333
at Function.Promise.try (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:91:24383)
at http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:91:23753
at Array.map ()
at Function.Promise.map (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:91:23708)
at callResponseHandlers (http://X.X.X.X:5601/bundles/kibana.bundle.js?v=15063:237:949)
at http://X.X.X.X:5601/bundles/kibana.bundle.js?v=15063:236:20482
at processQueue (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:38:23621)
at http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:38:23888
at Scope.$eval (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:39:4619)
at Scope.$digest (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:39:2359)
at Scope.$apply (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:39:5037)
at done (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:37:25027)
at completeRequest (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:37:28702)
at XMLHttpRequest.xhr.onload (http://X.X.X.X:5601/bundles/commons.bundle.js?v=15063:37:29634)