Reindex() work around for elastic/elasticsearch#21096

Author: gmarz

src/Nest/Document/Multiple/Reindex/ReindexObservable.cs

@@ -104,6 +104,10 @@ private void CreateIndex(string resolvedFrom, string resolvedTo)
 		{
 			var originalIndexSettings = this._client.GetIndex(resolvedFrom);
 			var originalIndexState = originalIndexSettings.Indices[resolvedFrom];
+
+			// work around https://github.com/elastic/elasticsearch/issues/21096
+			originalIndexState.Settings.Remove("index.provided_name");
+
 			var createIndexRequest = this._reindexRequest.CreateIndexRequest ?? new CreateIndexRequest(resolvedTo, originalIndexState);
 			var createIndexResponse = this._client.CreateIndex(createIndexRequest);
 			if (!createIndexResponse.IsValid)

src/Tests/Framework/TestClient.cs

@@ -49,7 +49,7 @@ private static ITestConfiguration LoadConfiguration()
 
 		private static ConnectionSettings DefaultSettings(ConnectionSettings settings) => settings
 			.DefaultIndex("default-index")
-			.PrettyJson()
+			//.PrettyJson()
 			.InferMappingFor<Project>(map => map
 				.IndexName("project")
 				.IdProperty(p => p.Name)