[PURIFY] remove all trace of x-pack enrichment processor (#9)

This commit removes all trace of the Elastic licensed enrichment processor.

client/rest-high-level/src/main/java/org/elasticsearch/client/RestHighLevelClient.java

@@ -271,7 +271,6 @@ public class RestHighLevelClient implements Closeable {
     private final RollupClient rollupClient = new RollupClient(this);
     private final CcrClient ccrClient = new CcrClient(this);
     private final TransformClient transformClient = new TransformClient(this);
-    private final EnrichClient enrichClient = new EnrichClient(this);
     private final AsyncSearchClient asyncSearchClient = new AsyncSearchClient(this);
 
     /**
@@ -507,10 +506,6 @@ public TransformClient transform() {
         return transformClient;
     }
 
-    public EnrichClient enrich() {
-        return enrichClient;
-    }
-
     /**
      * Executes a bulk request using the Bulk API.
      * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html">Bulk API on elastic.co</a>