rails 3 application behaving differently with the elasticsearch 1.7 using elasticsearch-rails and elasticsearch-model gem

Thanks for reading it. I am trying to implement the keyword search in my rails application. I wanted to categorize the results one after the other based on one field value. SO I tried to apply weight using function_score. The weight is working fine and I could able to categorize But the multi match query inside the function_score is not returning all results when I call from rails application But It is returning accurate results when I call it from sense.

Here is My sample Query:

"query": {
  "function_score": {
              "query": {
                "multi_match": {
                        "query": "reading",
                        "fields": ["field_1","field_2","field_3"]
                    }
              },
              "boost_mode": "sum",
              "functions": [
                {
                  "filter": {
                    "term": {
                      "field_4": "a"
                    }
                  },
                  "weight": 500
                },{
                  "filter": {
                    "term": {
                      "field_4": "b"
                    }
                  },
                  "weight": 400
                },
                {
                  "filter": {
                    "term": {
                      "field_4": "c"
                    }
                  },
                  "weight": 200
                },
                {
                  "filter": {
                    "term": {
                      "field_4": "d"
                    }
                  },
                  "weight": 100
                },
                {
                  "filter": {
                    "term": {
                      "field_4": "e"
                    }
                  },
                  "weight": 50
                }
              ]
            }

}

My result from sense: "hits": { "total": 397,

My result from rails3 application is giving 35 records.

Any help would be appreciated.