[CI] Auto commit changes from spotless

Author: elasticsearchmachine

server/src/test/java/org/elasticsearch/index/IndexVersionTests.java

@@ -16,7 +16,6 @@
 import org.hamcrest.Matchers;
 
 import java.lang.reflect.Modifier;
-import java.util.Collections;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Set;