Raise maximum index name length to 255 bytes

Fixes #8079

src/main/java/org/elasticsearch/cluster/metadata/MetaDataCreateIndexService.java

@@ -87,7 +87,7 @@ import static org.elasticsearch.common.settings.ImmutableSettings.settingsBuilde
  */
 public class MetaDataCreateIndexService extends AbstractComponent {
 
-    public final static int MAX_INDEX_NAME_BYTES = 100;
+    public final static int MAX_INDEX_NAME_BYTES = 255;
     private static final DefaultIndexTemplateFilter DEFAULT_INDEX_TEMPLATE_FILTER = new DefaultIndexTemplateFilter();
 
     private final Environment environment;