PLT-7040: Fix capitalisation of Elasticsearch in Config. (#7020)

config/config.json

@@ -50,7 +50,7 @@
         "EnableChannelViewedMessages": true,
         "ClusterLogTimeoutMilliseconds": 2000
     },
-    "ElasticSearchSettings": {
+    "ElasticsearchSettings": {
         "ConnectionUrl": "http://dockerhost:9200",
         "Username": "elastic",
         "Password": "changeme",