"baz", new String[] { "eee", "fff" });
        final Map<String, Object> resultMap = transformer.processFieldConfigs(dataMap, fieldConfigs);
        assertEquals("aaa", ((String[]) resultMap.get("foo"))[0]);
        assertEquals("bbb", ((String[]) resultMap.get("foo"))[1]);
        assertEquals("ddd", resultMap.get("bar"));
        assertEquals("fff", resultMap.get("baz"));
    }

    @Test

            final Map<String, Map<String, Object>> resultMap = new LinkedHashMap<>();
            for (final Map<String, Object> doc : results) {
                final String docId = (String) doc.get("doc_id");
                if (docId != null) {
                    resultMap.put(docId, doc);
                }
            }