Add beta tag to Elasticsearch (#7121)

* make Elasticsearch beta

* make Elasticsearch beta

* make Elasticsearch beta

webapp/i18n/en.json

@@ -234,7 +234,7 @@
   "admin.database.title": "Database Settings",
   "admin.developer.title": "Developer Settings",
   "admin.elasticsearchStatus.bulkIndexLabel": "Bulk Indexing:",
-  "admin.elasticsearch.title": "Elasticsearch Settings",
+  "admin.elasticsearch.title": "Elasticsearch (Beta)",
   "admin.elasticsearch.noteDescription": "Changing properties in this section will require a server restart before taking effect.",
   "admin.elasticsearch.enableIndexingTitle": "Enable Elasticsearch Indexing:",
   "admin.elasticsearch.enableIndexingDescription": "When true, indexing of new posts occurs automatically. Search queries will use database search until \"Enable Elasticsearch for search queries\" is enabled. {documentationLink}",
@@ -839,6 +839,7 @@
   "admin.sidebar.customization": "Customization",
   "admin.sidebar.database": "Database",
   "admin.sidebar.developer": "Developer",
+  "admin.sidebar.elasticsearch": "Elasticsearch (Beta)",
   "admin.sidebar.email": "Email",
   "admin.sidebar.emoji": "Emoji",
   "admin.sidebar.external": "External Services",