added support for `_matched_queries` in ES hits

this will make it easier to sort thru results from FallbackQuery by knowing which query was called

service/search.js

@@ -35,6 +35,7 @@ function service( backend, cmd, cb ){
         hit._source._id = hit._id;
         hit._source._type = hit._type;
         hit._source._score = hit._score;
+        hit._source._matched_queries = hit._matched_queries;
 
         return hit._source;
       });

test/unit/mock/backend.js

@@ -11,6 +11,7 @@ responses['client/search/ok/1'] = function( cmd, cb ){
     _id: 'myid1',
     _type: 'mytype1',
     _score: 10,
+    _matched_queries: ['query 1', 'query 2'],
     _source: {
       value: 1,
       center_point: { lat: 100.1, lon: -50.5 },
@@ -21,6 +22,7 @@ responses['client/search/ok/1'] = function( cmd, cb ){
     _id: 'myid2',
     _type: 'mytype2',
     _score: 20,
+    _matched_queries: ['query 3'],
     _source: {
       value: 2,
       center_point: { lat: 100.2, lon: -51.5 },

test/unit/service/search.js

@@ -20,6 +20,7 @@ module.exports.tests.functional_success = function(test, common) {
     {
       _id: 'myid1', _type: 'mytype1',
       _score: 10,
+      _matched_queries: ['query 1', 'query 2'],
       value: 1,
       center_point: { lat: 100.1, lon: -50.5 },
       name: { default: 'test name1' },
@@ -28,6 +29,7 @@ module.exports.tests.functional_success = function(test, common) {
     {
       _id: 'myid2', _type: 'mytype2',
       _score: 20,
+      _matched_queries: ['query 3'],
       value: 2,
       center_point: { lat: 100.2, lon: -51.5 },
       name: { default: 'test name2' },