diff --git a/src/main/java/org/xbib/elasticsearch/plugin/jdbc/PlainIndexableObject.java b/src/main/java/org/xbib/elasticsearch/plugin/jdbc/PlainIndexableObject.java
index 8a99ff17..54de9f82 100644
--- a/src/main/java/org/xbib/elasticsearch/plugin/jdbc/PlainIndexableObject.java
+++ b/src/main/java/org/xbib/elasticsearch/plugin/jdbc/PlainIndexableObject.java
@@ -178,7 +178,16 @@ protected boolean checkCollapsedMapLength(Map<String, Object> map) {
     @SuppressWarnings({"unchecked"})
     protected XContentBuilder toXContent(XContentBuilder builder, Params params, List list) throws IOException {
         builder.startArray();
+        HashValueCalculator hashUtil = new HashValueCalculator();
+        long prev = 0;
+        long current = 0;
         for (Object o : list) {
+            current = hashUtil.calculate(o);
+            if ( current == prev ) {
+                continue;
+            } else {
+                prev = current;
+            }
             if (o instanceof Values) {
                 Values v = (Values) o;
                 v.toXContent(builder, ToXContent.EMPTY_PARAMS);
@@ -233,4 +242,58 @@ public int hashCode() {
         return hash;
     }
 
+    /**
+     * Implementing hash calculator on es graph object. it is used to identify same graps in the structure
+     */
+     private class HashValueCalculator  {
+
+         public long calculate(Object o) throws IOException {
+             long hash = 0;
+             if (o instanceof Values) {
+                 Values v = (Values) o;
+                 hash = calculate(v);
+             } else if (o instanceof Map) {
+                 hash = calculate((Map<String, Object>) o);
+             } else if (o instanceof List) {
+                 hash = calculate((List) o);
+             } else {
+                 try {
+                     hash = hash + o.hashCode();
+                 } catch (Exception e) {
+                     throw new IOException("unknown object class:" + o.getClass().getName());
+                 }
+             }
+             return hash;
+         }
+
+         public long calculate(Values values) throws IOException {
+             long hash = 0;
+             if ( values != null && !values.isNull() ) {
+                 for ( Object o : values.getValues()) {
+                    hash = hash + o.hashCode();
+                 }
+             }
+             return hash;
+         }
+
+        public long calculate(List list) throws IOException {
+            long hash = 0;
+            for (Object o : list) {
+               hash = hash + calculate(o);
+            }
+            return hash;
+        }
+
+        public long calculate(Map<String, Object> map) throws IOException {
+            long hash = 0;
+            for (Map.Entry<String, Object> k : map.entrySet()) {
+                Object o = k.getValue();
+                if (ignoreNull && (o == null || (o instanceof Values) && ((Values) o).isNull())) {
+                    continue;
+                }
+                hash = hash + calculate(o);
+            }
+            return hash;
+        }
+    }
 }
diff --git a/src/test/java/org/xbib/elasticsearch/river/jdbc/support/ValueListenerTests.java b/src/test/java/org/xbib/elasticsearch/river/jdbc/support/ValueListenerTests.java
index 567ec82e..e4088b40 100644
--- a/src/test/java/org/xbib/elasticsearch/river/jdbc/support/ValueListenerTests.java
+++ b/src/test/java/org/xbib/elasticsearch/river/jdbc/support/ValueListenerTests.java
@@ -231,6 +231,7 @@ public void testArrays() throws Exception {
         List<String> row1 = Arrays.asList("4679", "Tesla, Abe and Elba", "2014-01-06 00:00:00", "3917", "Idris Elba", "9450", "/web/q/g/h/57436356.jpg");
         List<String> row2 = Arrays.asList("4679", "Tesla, Abe and Elba", "2014-01-06 00:00:00", "3917", "Idris Elba", "9965", "/web/i/s/q/GS3193626.jpg");
         List<String> row3 = Arrays.asList("4679", "Tesla, Abe and Elba", "2014-01-06 00:00:00", "3917", "Idris Elba", "9451", "/web/i/s/q/GS3193626.jpg");
+        List<String> row4 = Arrays.asList("4679", "Tesla, Abe and Elba", "2014-01-06 00:00:00", "3918", "Idris Elba", "9451", "/web/i/s/q/GS3193626.jpg");
         MockRiverMouth output = new MockRiverMouth();
         new StringKeyValueStreamListener()
                 .output(output)
@@ -239,9 +240,10 @@ public void testArrays() throws Exception {
                 .values(row1)
                 .values(row2)
                 .values(row3)
+                .values(row4)
                 .end();
         assertEquals(output.data().toString(),
-                "{[null/null/null/4679]->{blog={name=\"Tesla, Abe and Elba\", published=\"2014-01-06 00:00:00\", association=[{id=\"3917\", name=\"Idris Elba\"}, {id=\"3917\", name=\"Idris Elba\"}, {id=\"3917\", name=\"Idris Elba\"}], attachment=[{id=\"9450\", name=\"/web/q/g/h/57436356.jpg\"}, {id=\"9965\", name=\"/web/i/s/q/GS3193626.jpg\"}, {id=\"9451\", name=\"/web/i/s/q/GS3193626.jpg\"}]}}={\"blog\":{\"name\":\"Tesla, Abe and Elba\",\"published\":\"2014-01-06 00:00:00\",\"association\":[{\"id\":\"3917\",\"name\":\"Idris Elba\"},{\"id\":\"3917\",\"name\":\"Idris Elba\"},{\"id\":\"3917\",\"name\":\"Idris Elba\"}],\"attachment\":[{\"id\":\"9450\",\"name\":\"/web/q/g/h/57436356.jpg\"},{\"id\":\"9965\",\"name\":\"/web/i/s/q/GS3193626.jpg\"},{\"id\":\"9451\",\"name\":\"/web/i/s/q/GS3193626.jpg\"}]}}}"
+                "{[null/null/null/4679]->{blog={name=\"Tesla, Abe and Elba\", published=\"2014-01-06 00:00:00\", association=[{id=\"3917\", name=\"Idris Elba\"}, {id=\"3917\", name=\"Idris Elba\"}, {id=\"3917\", name=\"Idris Elba\"}, {id=\"3918\", name=\"Idris Elba\"}], attachment=[{id=\"9450\", name=\"/web/q/g/h/57436356.jpg\"}, {id=\"9965\", name=\"/web/i/s/q/GS3193626.jpg\"}, {id=\"9451\", name=\"/web/i/s/q/GS3193626.jpg\"}, {id=\"9451\", name=\"/web/i/s/q/GS3193626.jpg\"}]}}={\"blog\":{\"name\":\"Tesla, Abe and Elba\",\"published\":\"2014-01-06 00:00:00\",\"association\":[{\"id\":\"3917\",\"name\":\"Idris Elba\"},{\"id\":\"3918\",\"name\":\"Idris Elba\"}],\"attachment\":[{\"id\":\"9450\",\"name\":\"/web/q/g/h/57436356.jpg\"},{\"id\":\"9965\",\"name\":\"/web/i/s/q/GS3193626.jpg\"},{\"id\":\"9451\",\"name\":\"/web/i/s/q/GS3193626.jpg\"}]}}}"
         );
     }