Make sure aliases can be accessed through 'doc'.

modules/lang-expression/src/test/java/org/elasticsearch/script/expression/ExpressionTests.java

@@ -51,6 +51,7 @@ public void setUp() throws Exception {
         NumberFieldType fieldType = new NumberFieldType(NumberType.DOUBLE);
         MapperService mapperService = mock(MapperService.class);
         when(mapperService.fullName("field")).thenReturn(fieldType);
+        when(mapperService.fullName("alias")).thenReturn(fieldType);
 
         SortedNumericDoubleValues doubleValues = mock(SortedNumericDoubleValues.class);
         when(doubleValues.advanceExact(anyInt())).thenReturn(true);
@@ -100,4 +101,12 @@ public void testFieldAccess() throws IOException {
         double result = script.runAsDouble();
         assertEquals(2.718, result, 0.0);
     }
+
+    public void testFieldAccessWithFieldAlias() throws IOException {
+        SearchScript script = compile("doc['alias'].value").newInstance(null);
+        script.setDocument(1);
+
+        double result = script.runAsDouble();
+        assertEquals(2.718, result, 0.0);
+    }
 }

server/src/test/java/org/elasticsearch/search/lookup/LeafDocLookupTests.java

@@ -0,0 +1,75 @@
+/*
+ * Licensed to Elasticsearch 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.search.lookup;
+
+import org.elasticsearch.index.fielddata.AtomicFieldData;
+import org.elasticsearch.index.fielddata.IndexFieldData;
+import org.elasticsearch.index.fielddata.ScriptDocValues;
+import org.elasticsearch.index.mapper.MappedFieldType;
+import org.elasticsearch.index.mapper.MapperService;
+import org.elasticsearch.test.ESTestCase;
+import org.junit.Before;
+
+import static org.mockito.AdditionalAnswers.returnsFirstArg;
+import static org.mockito.Matchers.anyObject;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class LeafDocLookupTests extends ESTestCase {
+    private ScriptDocValues<?> docValues;
+    private LeafDocLookup docLookup;
+
+    @Before
+    public void setUp() throws Exception {
+        super.setUp();
+
+        MappedFieldType fieldType = mock(MappedFieldType.class);
+        when(fieldType.name()).thenReturn("field");
+        when(fieldType.valueForDisplay(anyObject())).then(returnsFirstArg());
+
+        MapperService mapperService = mock(MapperService.class);
+        when(mapperService.fullName("field")).thenReturn(fieldType);
+        when(mapperService.fullName("alias")).thenReturn(fieldType);
+
+        docValues = mock(ScriptDocValues.class);
+
+        AtomicFieldData atomicFieldData = mock(AtomicFieldData.class);
+        doReturn(docValues).when(atomicFieldData).getScriptValues();
+
+        IndexFieldData<?> fieldData = mock(IndexFieldData.class);
+        when(fieldData.getFieldName()).thenReturn("field");
+        doReturn(atomicFieldData).when(fieldData).load(anyObject());
+
+        docLookup = new LeafDocLookup(mapperService,
+            ignored -> fieldData,
+            new String[] { "type" },
+            null);
+    }
+
+    public void testBasicLookup() {
+        ScriptDocValues<?> fetchedDocValues = docLookup.get("field");
+        assertEquals(docValues, fetchedDocValues);
+    }
+
+    public void testLookupWithFieldAlias() {
+        ScriptDocValues<?> fetchedDocValues = docLookup.get("alias");
+        assertEquals(docValues, fetchedDocValues);
+    }
+}