Quote properties.

(query/sort, test/unit/query/search).js
	-Address @dianashk's comment:
	https://github.com/pelias/api/pull/113/files#r29764750

query/sort.js

@@ -53,13 +53,13 @@ module.exports = function( params ){
 
   if( isObject( params ) && params.hasOwnProperty( 'input' ) ){
     scriptsConfig.push({
-      _script: {
+      '_script': {
-        params: {
+        'params': {
-          input: params.input
+          'input': params.input
         },
-        file: 'exact_match',
+        'file': 'exact_match',
-        type: 'number',
+        'type': 'number',
-        order: 'desc'
+        'order': 'desc'
       }
     });
   }

test/unit/query/search.js

@@ -60,13 +60,13 @@ var sort = [
     }
   },
   {
-    _script: {
+    '_script': {
-      params: {
+      'params': {
-        input: 'test'
+        'input': 'test'
       },
-      file: 'exact_match',
+      'file': 'exact_match',
-      type: 'number',
+      'type': 'number',
-      order: 'desc'
+      'order': 'desc'
     }
   }
 ];