[MM-49084] public/model/config: elasticsearch: add ingore option to some indexes to purge (#23571)

server/i18n/en.json

@@ -8687,6 +8687,10 @@
     "id": "model.config.is_valid.elastic_search.enable_searching.app_error",
     "translation": "Elasticsearch EnableIndexing setting must be set to true when Elasticsearch EnableSearching is set to true"
   },
+  {
+    "id": "model.config.is_valid.elastic_search.ignored_indexes_dash_prefix.app_error",
+    "translation": "Ignored indexes for purge should not start with dash."
+  },
   {
     "id": "model.config.is_valid.elastic_search.live_indexing_batch_size.app_error",
     "translation": "Elasticsearch Live Indexing Batch Size must be at least 1."