Unable to connect ElasticSearch at https://logging-es:9200 with full storage

Issue

• Kibana reports "Unable to connect to elasticsearch at https://logging-es:9200", logging-kibana-1-jgls9:

  Unable to connect to Elasticsearch at https://logging-es:9200.","prevState":"red","prevMsg":"Request Timeout after 3000ms"}
  {"type":"response","@timestamp":"2018-10-29T07:54:58Z","tags":[],"pid":226,"method":"head","statusCode":200,"req":{"url":"/","method":"head","headers":{"user-agent":"curl/7.29.0","host":"localhost:5601","accept":"*/*"},"remoteAddress":"127.0.0.1","userAgent":"127.0.0.1"},"res":{"statusCode":200,"responseTime":1,"contentLength":9},"message":"HEAD / 200 1ms - 9.0B"}
  {"type":"log","@timestamp":"2018-10-29T07:55:01Z","tags":["status","plugin:elasticsearch@5.6.10","error"],"pid":226,"state":"red","message":"Status changed from red to red - Request Timeout after 3000ms","prevState":"red","prevMsg":"Unable to connect to Elasticsearch at https://logging-es:9200."}
  

• logging-es pod logs:

  /elasticsearch/persistent is full in logging-es-data-master-3n4bu39j-1-5rm6f pod