protected void setLoggingRequestHelperFactory(LoggingRequestHelperFactory loggingRequestHelperFactory) {
      this.loggingRequestHelperFactory = loggingRequestHelperFactory;
    }
A {@link Runnable} used to make requests to the remote LogSearch server's
  REST API.

This implementation will update a cache shared with the {@link LogSearchDataRetrievalService},
  which can then be used for subsequent requests for the same data.
ambari-server/src/main/java/org/apache/ambari/server/controller/logging/LogSearchDataRetrievalService.java