fix #839 disable ESLogger

pom.xml

@@ -63,7 +63,7 @@
 
 		<!-- Elasticsearch -->
 		<elasticsearch.version>5.1.2</elasticsearch.version>
-		<cluster.runner.version>5.1.2.0</cluster.runner.version>
+		<cluster.runner.version>5.1.2.1-SNAPSHOT</cluster.runner.version>
 
 		<!-- Tomcat -->
 		<tomcat.version>8.5.9</tomcat.version>

src/main/java/org/codelibs/fess/es/client/FessEsClient.java

@@ -239,6 +239,7 @@ public class FessEsClient implements Client {
                 if (esDir != null) {
                     config.basePath(esDir);
                 }
+                config.disableESLogger();
                 runner.onBuild((number, settingsBuilder) -> {
                     final File pluginDir = new File(esDir, "plugins");
                     if (pluginDir.isDirectory()) {