PLT-6472: Basic Elastic Search implementation. (#6382)

* PLT-6472: Basic Elastic Search implementation.

This currently supports indexing of posts at create/update/delete time.
It does not support batch indexing or reindexing, and does not support
any entities other than posts yet. The purpose is to more-or-less
replicate the existing full-text search feature but with some of the
immediate benefits of using elastic search.

* Alter settings for AWS compatability.

* Remove unneeded i18n strings.

cmd/platform/server.go

@@ -114,6 +114,12 @@ func runServer(configFileLocation string) {
 		einterfaces.GetMetricsInterface().StartServer()
 	}
 
+	if einterfaces.GetElasticSearchInterface() != nil {
+		if err := einterfaces.GetElasticSearchInterface().Start(); err != nil {
+			l4g.Error(err.Error())
+		}
+	}
+
 	// wait for kill signal before attempting to gracefully shutdown
 	// the running service
 	c := make(chan os.Signal)