HSEARCH-3934 Add index property SCHEMA_MANAGEMENT_SETTINGS_FILE

backend/elasticsearch/src/main/java/org/hibernate/search/backend/elasticsearch/cfg/ElasticsearchIndexSettings.java

@@ -52,6 +52,18 @@ private ElasticsearchIndexSettings() {
 	 */
 	public static final String SCHEMA_MANAGEMENT_MINIMAL_REQUIRED_STATUS_WAIT_TIMEOUT = "schema_management.minimal_required_status_wait_timeout";
 
+	/**
+	 * Allows the user to provide a custom index settings, instead of having it generated by Hibernate Search.
+	 * The value of the property must be a valid path to the file containing the custom settings.
+	 * The file must contain the index setting expressed in JSON format, as expected by the Elasticsearch server.
+	 * <p>
+	 * Note that the settings generated by Hibernate Search won't be applied.
+	 * This means for instance that any analyzer defined by the {@link #ANALYSIS_CONFIGURER} will be ignored.
+	 * <p>
+	 * Defaults to no value. Because by default index settings are generated by Hibernate Search.
+	 */
+	public static final String SCHEMA_MANAGEMENT_SETTINGS_FILE = "schema_management.settings_file";
+
 	/**
 	 * The prefix for indexing-related property keys.
 	 */