Revert "Silence reindex's rest tests"

This reverts commit aa0ef84f5a6dc1a4621e5b896f2177bb904b0dce.

modules/reindex/build.gradle

@@ -21,8 +21,3 @@ esplugin {
   description 'The Reindex module adds APIs to reindex from one index to another or update documents in place.'
   classname 'org.elasticsearch.index.reindex.ReindexPlugin'
 }
-
-integTest {
-  // Since there is only a single integTest and we're disabling it we need to disable the whole phase
-  enabled = false
-}

modules/reindex/src/test/java/org/elasticsearch/index/reindex/ReindexRestIT.java

@@ -22,14 +22,12 @@ package org.elasticsearch.index.reindex;
 import com.carrotsearch.randomizedtesting.annotations.Name;
 import com.carrotsearch.randomizedtesting.annotations.ParametersFactory;
 
-import org.apache.lucene.util.LuceneTestCase.AwaitsFix;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.elasticsearch.test.rest.RestTestCandidate;
 import org.elasticsearch.test.rest.parser.RestTestParseException;
 
 import java.io.IOException;
 
-@AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/16906")
 public class ReindexRestIT extends ESRestTestCase {
     public ReindexRestIT(@Name("yaml") RestTestCandidate testCandidate) {
         super(testCandidate);