wow this is easy to get wrong, added a unit test

query/reverse.js

@@ -28,6 +28,9 @@ function generateQuery( clean ){
     vs.var( 'size', clean.querySize);
   }
 
+  // sources
+  vs.var( 'sources', clean.sources);
+
   // focus point to score by distance
   if( check.number(clean['point.lat']) &&
       check.number(clean['point.lon']) ){

query/search.js

@@ -51,6 +51,7 @@ function generateQuery( clean ){
   // input text
   vs.var( 'input:name', clean.text );
 
+  // sources
   vs.var( 'sources', clean.sources);
 
   // size

test/unit/fixture/reverse_with_source_filtering.js

@@ -0,0 +1,51 @@
+var vs = require('../../../query/reverse_defaults');
+
+module.exports = {
+  'query': {
+    'filtered': {
+      'query': {
+        'bool': {
+          'must': []
+        }
+      },
+      'filter': {
+        'bool': {
+          'must': [
+            {
+              'geo_distance': {
+                'distance': '500km',
+                'distance_type': 'plane',
+                'optimize_bbox': 'indexed',
+                '_cache': true,
+                'center_point': {
+                  'lat': 29.49136,
+                  'lon': -82.50622
+                }
+              }
+            },
+            {
+              'terms': {
+                'source': ['test']
+              }
+            }
+          ]
+        }
+      }
+    }
+  },
+  'sort': [
+    '_score',
+    {
+      '_geo_distance': {
+        'center_point': {
+          'lat': 29.49136,
+          'lon': -82.50622
+        },
+        'order': 'asc',
+        'distance_type': 'plane'
+      }
+    }
+  ],
+  'size': vs.size,
+  'track_scores': true
+};

test/unit/query/reverse.js

@@ -108,6 +108,23 @@ module.exports.tests.query = function(test, common) {
     t.deepEqual(compiled, expected, 'valid reverse query with boundary.country');
     t.end();
   });
+
+  test('valid sources filter', function(t) {
+    var query = generate({
+      'point.lat': 29.49136,
+      'point.lon': -82.50622,
+      'boundary.circle.lat': 29.49136,
+      'boundary.circle.lon': -82.50622,
+      'boundary.circle.radius': 500,
+      'sources': ['test']
+    });
+
+    var compiled = JSON.parse( JSON.stringify( query ) );
+    var expected = require('../fixture/reverse_with_source_filtering');
+
+    t.deepEqual(compiled, expected, 'valid reverse query with source filtering');
+    t.end();
+  });
 };
 
 module.exports.all = function (tape, common) {