Github user mattyb149 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1276#discussion_r90534894
  
    --- Diff: 
nifi-nar-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-processors/src/main/java/org/apache/nifi/processors/elasticsearch/AbstractElasticsearchProcessor.java
 ---
    @@ -28,14 +29,20 @@
     
     import java.util.Collection;
     import java.util.HashSet;
    -import java.util.Map;
     import java.util.Set;
     
     /**
      * A base class for all Elasticsearch processors
      */
     public abstract class AbstractElasticsearchProcessor extends 
AbstractProcessor {
     
    +    protected static final Validator NON_EMPTY_EL_VALIDATOR = (subject, 
value, context) -> {
    --- End diff --
    
    Opened [NIFI-3139](https://issues.apache.org/jira/browse/NIFI-3139) to move 
the validators to StandardValidators


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