Fixed file-based template loading via config/templates

When parsing the json file, the first field is ignored as
parser.nextToken() seems to be called too often.

Closes #4235

src/main/java/org/elasticsearch/cluster/metadata/MetaDataCreateIndexService.java

@@ -482,7 +482,7 @@ private List<IndexTemplateMetaData> findTemplates(Request request, ClusterState
                     try {
                         byte[] templatesData = Streams.copyToByteArray(templatesFile);
                         parser = XContentHelper.createParser(templatesData, 0, templatesData.length);
-                        IndexTemplateMetaData template = IndexTemplateMetaData.Builder.fromXContentStandalone(parser);
+                        IndexTemplateMetaData template = IndexTemplateMetaData.Builder.fromXContent(parser);
                         if (Regex.simpleMatch(template.template(), request.index)) {
                             templates.add(template);
                         }

src/test/java/org/elasticsearch/indices/template/IndexTemplateFileLoadingTests.java

@@ -0,0 +1,78 @@
+/*
+ * Licensed to ElasticSearch and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. ElasticSearch licenses this
+ * file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.elasticsearch.indices.template;
+
+import com.google.common.base.Charsets;
+import com.google.common.io.Files;
+import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
+import org.elasticsearch.common.io.Streams;
+import org.elasticsearch.common.settings.ImmutableSettings;
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.test.ElasticsearchIntegrationTest;
+import org.elasticsearch.test.ElasticsearchIntegrationTest.ClusterScope;
+import org.elasticsearch.test.ElasticsearchIntegrationTest.Scope;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import java.io.File;
+
+import static org.hamcrest.Matchers.is;
+
+/**
+ *
+ */
+@ClusterScope(scope= Scope.SUITE, numNodes=1)
+public class IndexTemplateFileLoadingTests extends ElasticsearchIntegrationTest {
+
+    @Rule
+    public TemporaryFolder temporaryFolder = new TemporaryFolder();
+
+    @Override
+    protected Settings nodeSettings(int nodeOrdinal) {
+        ImmutableSettings.Builder settingsBuilder = ImmutableSettings.settingsBuilder();
+        settingsBuilder.put(super.nodeSettings(nodeOrdinal));
+
+        try {
+            File directory = temporaryFolder.newFolder();
+            settingsBuilder.put("path.conf", directory.getPath());
+
+            File templatesDir = new File(directory + File.separator + "templates");
+            templatesDir.mkdir();
+
+            File dst = new File(templatesDir, "template.json");
+            String template = Streams.copyToStringFromClasspath("/org/elasticsearch/indices/template/template.json");
+            Files.write(template, dst, Charsets.UTF_8);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+
+        return settingsBuilder.build();
+    }
+
+    @Test
+    public void testThatLoadingTemplateFromFileWorks() throws Exception {
+        createIndex("foobar");
+        ensureYellow(); // ensuring yellow so the test fails faster if the template cannot be loaded
+
+        ClusterStateResponse stateResponse = client().admin().cluster().prepareState().setFilterIndices("foobar").get();
+        assertThat(stateResponse.getState().getMetaData().indices().get("foobar").getNumberOfShards(), is(10));
+        assertThat(stateResponse.getState().getMetaData().indices().get("foobar").getNumberOfReplicas(), is(0));
+    }
+}

src/test/java/org/elasticsearch/indices/template/template.json

@@ -0,0 +1,7 @@
+{
+    "template" : "foo*",
+    "settings" : {
+        "index.number_of_shards": 10,
+        "index.number_of_replicas": 0
+   }
+}