HSEARCH-3902 Close indexes instead of deleting them to simulate failu…

…res on Elasticsearch indexes

integrationtest/backend/elasticsearch/src/test/java/org/hibernate/search/integrationtest/backend/elasticsearch/testsupport/util/ElasticsearchTckBackendAccessor.java

@@ -25,13 +25,7 @@ public void close() throws IOException {
 
 	@Override
 	public void ensureIndexOperationsFail(String indexName) {
-		client.index( indexName ).delete();
-		/*
-		 * Automatic index creation might get in the way and make operation succeed
-		 * even though the index doesn't exist, so we disable it.
-		 * We never rely on automatic index creation,
-		 * so leaving this setting in place afterwards is not a problem.
-		 */
-		client.clusterSettings( "action.auto_create_index" ).put( "false" );
+		// Close the index so that every operation will fail
+		client.index( indexName ).close();
 	}
 }

util/internal/integrationtest/backend/elasticsearch/src/main/java/org/hibernate/search/util/impl/integrationtest/backend/elasticsearch/rule/TestElasticsearchClient.java

@@ -125,6 +125,11 @@ public IndexClient delete() {
 			return this;
 		}
 
+		public IndexClient close() {
+			TestElasticsearchClient.this.closeIndex( primaryIndexName );
+			return this;
+		}
+
 		public IndexClient ensureDoesNotExist() {
 			TestElasticsearchClient.this.ensureIndexDoesNotExist( primaryIndexName );
 			return this;
@@ -394,6 +399,21 @@ private void deleteIndex(URLEncodedString indexName) {
 		tryDeleteESIndex( indexName );
 	}
 
+	private void closeIndex(URLEncodedString indexName) {
+		try {
+			performRequest( ElasticsearchRequest.post()
+					.pathComponent( indexName )
+					.pathComponent( Paths._CLOSE )
+					.build() );
+		}
+		catch (RuntimeException e) {
+			throw new AssertionFailure(
+					String.format( Locale.ROOT, "Error while trying to close index '%s' in the test client", indexName ),
+					e
+			);
+		}
+	}
+
 	private void createTemplate(String templateName, String templateString, int templateOrder, JsonObject settings) {
 		JsonObject source = new JsonObject();
 		dialect.setTemplatePattern( source, templateString );