Add support for indexing tags meta-attribute

Add tags indexing for search

Issue: 39

Depends on os-core-common MR: 55

testing/indexer-test-core/src/main/java/org/opengroup/osdu/util/ElasticUtils.java

@@ -62,6 +62,7 @@ import java.util.ArrayList;
 import java.util.Base64;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;