Getting custom calculated value in script field of Elasticsearch -

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i want multiplication of 2 values in script field in elastic search shown in image. how this?

enter image description here

i using below aggregation code

{     "aggs": {         "mention": {             "terms": {                 "size": 20,                 "field": "username"             },             "aggs": {                 "mention_hits": {                     "top_hits": {                         "sort": [                             {                                 "published_date": {                                     "order": "desc"                                 }                             }                         ],                         "_source": {                             "include": [                                 "klout"                             ]                         },                         "size": 1                     }                 },                 "user_ranking": {                     "max": {                         "script": " 123 "                     }                 }             }         }     } }


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