Use apikey to access elastic search

src/Serilog.Sinks.Elasticsearch/Sinks/ElasticSearch/ElasticsearchSinkOptions.cs

@@ -281,6 +281,11 @@ public int QueueSizeLimit
         /// </summary>
         public RollingInterval BufferFileRollingInterval { get; set; }
 
+        /// <summary>
+        /// Apikey to access elasticsearch, the value is encoded, atob(`id:apikey`).This is another method instead user/password
+        /// </summary>
+        public string Apikey { get; set; }
+
         /// <summary>
         /// Configures the elasticsearch sink defaults
         /// </summary>

src/Serilog.Sinks.Elasticsearch/Sinks/ElasticSearch/ElasticsearchSinkState.cs

@@ -86,6 +86,9 @@ private ElasticsearchSinkState(ElasticsearchSinkOptions options)
             if (options.ModifyConnectionSettings != null)
                 configuration = options.ModifyConnectionSettings(configuration);
 
+            if (!string.IsNullOrEmpty(options.Apikey))
+                configuration = configuration.ApiKeyAuthentication(new ApiKeyAuthenticationCredentials(options.Apikey));
+
             configuration.ThrowExceptions();
 
             _client = new ElasticLowLevelClient(configuration);