remove lang url parameter from stored script requests (elastic/x-pack-elasticsearch#2029)

Original commit: elastic/x-pack-elasticsearch@1044c3ba53

plugin/src/test/java/org/elasticsearch/xpack/watcher/test/integration/BasicWatcherTests.java

@@ -230,7 +230,6 @@ public class BasicWatcherTests extends AbstractWatcherIntegrationTestCase {
     public void testConditionSearchWithIndexedTemplate() throws Exception {
         SearchSourceBuilder searchSourceBuilder = searchSource().query(matchQuery("level", "a"));
         assertAcked(client().admin().cluster().preparePutStoredScript()
-                .setLang("mustache")
                 .setId("my-template")
                 .setContent(jsonBuilder().startObject().field("template").value(searchSourceBuilder).endObject().bytes(), XContentType.JSON)
                 .get());

plugin/src/test/java/org/elasticsearch/xpack/watcher/transform/TransformIntegrationTests.java

@@ -120,8 +120,8 @@ public class TransformIntegrationTests extends AbstractWatcherIntegrationTestCas
             logger.info("testing script transform with an indexed script");
             assertAcked(client().admin().cluster().preparePutStoredScript()
                     .setId("my-script")
-                    .setLang("mockscript")
-                    .setContent(new BytesArray("{\"script\" : \"['key3' : ctx.payload.key1 + ctx.payload.key2]\"}"), XContentType.JSON)
+                    .setContent(new BytesArray("{\"script\" : {\"lang\": \"" + MockScriptPlugin.NAME + "\", " +
+                            "\"source\": \"['key3' : ctx.payload.key1 + ctx.payload.key2]\"}"), XContentType.JSON)
                     .get());
             script = new Script(ScriptType.STORED, null, "my-script", Collections.emptyMap());
         }