[Tests] #24638 Fix rest high level client docs build by restoring hasChild and hasParent in the tests

client/rest-high-level/build.gradle

@@ -29,6 +29,8 @@ dependencies {
 
   testCompile "org.elasticsearch.client:test:${version}"
   testCompile "org.elasticsearch.test:framework:${version}"
+  // for parent/child testing
+  testCompile "org.elasticsearch.plugin:parent-join-client:${version}"
   testCompile "com.carrotsearch.randomizedtesting:randomizedtesting-runner:${versions.randomizedrunner}"
   testCompile "junit:junit:${versions.junit}"
   testCompile "org.hamcrest:hamcrest-all:${versions.hamcrest}"

client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/QueryDSLDocumentationTests.java

@@ -77,6 +77,8 @@ import static org.elasticsearch.index.query.QueryBuilders.typeQuery;
 import static org.elasticsearch.index.query.QueryBuilders.wildcardQuery;
 import static org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders.exponentialDecayFunction;
 import static org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders.randomFunction;
+import static org.elasticsearch.join.query.JoinQueryBuilders.hasChildQuery;
+import static org.elasticsearch.join.query.JoinQueryBuilders.hasParentQuery;
 
 /**
  * Examples of using the transport client that are imported into the transport client documentation.
@@ -214,6 +216,24 @@ public class QueryDSLDocumentationTests extends ESTestCase {
         }
     }
 
+    public void testHasChild() {
+        // tag::has_child
+        hasChildQuery(
+                "blog_tag",                                          // <1>
+                termQuery("tag","something"),                        // <2>
+                ScoreMode.None);                                     // <3>
+        // end::has_child
+    }
+
+    public void testHasParent() {
+        // tag::has_parent
+        hasParentQuery(
+            "blog",                                                  // <1>
+            termQuery("tag","something"),                            // <2>
+            false);                                                  // <3>
+        // end::has_parent
+    }
+
     public void testIds() {
         // tag::ids
         idsQuery("my_type", "type2")