[PURIFY] remove all trace of x-pack ccr (opensearch-project#11)

This committ removes all trace of Elastic licensed CCR.

Signed-off-by: Peter Nied <petern@amazon.com>

Author: nknize

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

@@ -269,7 +269,6 @@ public class RestHighLevelClient implements Closeable {
     private final SecurityClient securityClient = new SecurityClient(this);
     private final IndexLifecycleClient ilmClient = new IndexLifecycleClient(this);
     private final RollupClient rollupClient = new RollupClient(this);
-    private final CcrClient ccrClient = new CcrClient(this);
     private final TransformClient transformClient = new TransformClient(this);
 
     /**
@@ -364,20 +363,6 @@ public RollupClient rollup() {
         return rollupClient;
     }
 
-    /**
-     * Provides methods for accessing the Elastic Licensed CCR APIs that
-     * are shipped with the Elastic Stack distribution of Elasticsearch. All of
-     * these APIs will 404 if run against the OSS distribution of Elasticsearch.
-     * <p>
-     * See the <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/ccr-api.html">
-     * CCR APIs on elastic.co</a> for more information.
-     *
-     * @return the client wrapper for making CCR API calls
-     */
-    public final CcrClient ccr() {
-        return ccrClient;
-    }
-
     /**
      * Provides a {@link TasksClient} which can be used to access the Tasks API.
      *