HSEARCH-2520 Log automatic closings and openings of Elasticsearch ind…

…exes

This is important information, because it might have side-effects on
other clients of those indexes, so the INFO level is relevant here.

These logs shouldn't be very frequent (only one or two per index on
startup).

elasticsearch/src/main/java/org/hibernate/search/elasticsearch/logging/impl/Log.java

@@ -372,4 +372,22 @@ BulkRequestFailedException elasticsearchBulkRequestFailed(String request, String
 	)
 	SearchException elasticsearchIndexSettingsRetrievalForValidationFailed(@Cause Exception cause);
 
+	@LogMessage(level = Level.INFO)
+	@Message(id = ES_BACKEND_MESSAGES_START_ID + 69,
+			value = "Closed Elasticsearch index '%1$s' automatically."
+	)
+	void closedIndex(String indexName);
+
+	@LogMessage(level = Level.INFO)
+	@Message(id = ES_BACKEND_MESSAGES_START_ID + 70,
+			value = "Opened Elasticsearch index '%1$s' automatically."
+	)
+	void openedIndex(String indexName);
+
+	@LogMessage(level = Level.ERROR)
+	@Message(id = ES_BACKEND_MESSAGES_START_ID + 71,
+			value = "Failed to open Elasticsearch index '%1$s' ; see the stack trace below."
+	)
+	void failedToOpenIndex(String indexName);
+
 }

elasticsearch/src/main/java/org/hibernate/search/elasticsearch/schema/impl/ElasticsearchSchemaAccessor.java

@@ -248,9 +248,17 @@ public void dropIndex(String indexName, ExecutionOptions executionOptions) {
 
 	public void closeIndex(String indexName) {
 		jestClient.executeRequest( new CloseIndex.Builder( indexName ).build() );
+		LOG.closedIndex( indexName );
 	}
 
 	public void openIndex(String indexName) {
-		jestClient.executeRequest( new OpenIndex.Builder( indexName ).build() );
+		try {
+			jestClient.executeRequest( new OpenIndex.Builder( indexName ).build() );
+		}
+		catch (RuntimeException e) {
+			LOG.openedIndex( indexName );
+			throw e;
+		}
+		LOG.openedIndex( indexName );
 	}
 }