# How to use size API in composite aggregation for unique terms

**URL:** <https://discuss.elastic.co/t/how-to-use-size-api-in-composite-aggregation-for-unique-terms/201587>\
**Category:** Elasticsearch\
**Created:** [September 30, 2019, 7:58am UTC](https://discuss.elastic.co/t/how-to-use-size-api-in-composite-aggregation-for-unique-terms/201587 "2019-09-30T07:58:28Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sakthivanan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sakthivanan/32/77897_2.png) [@Sakthivanan](https://discuss.elastic.co/u/Sakthivanan)\
**Post date:** [September 30, 2019, 7:58am UTC](https://discuss.elastic.co/t/how-to-use-size-api-in-composite-aggregation-for-unique-terms/201587/1 "2019-09-30T07:58:29Z")

</div>

GET teacher\_dashboard\_student\_kpi\_master\_index/\_search  
{  
"size": 0,  
"query": {  
"bool": {  
"filter": [  
],  
"must": [  
]  
}  
},  
"aggs": {  
"my\_buckets": {  
"composite": {  
"size": 2,  
"sources": [  
{  
"school\_year": {  
"terms": {  
"field": "school\_year",  
"order": "asc",  
"size": 1  
}  
}  
},  
{  
"student\_id": {  
"terms": {  
"field": "student\_id",  
"order": "desc",  
"size": 999  
}  
}  
},  
{  
"metric\_id": {  
"terms": {  
"field": "metric\_id"  
}  
}  
}  
]  
},  
"aggs": {  
"sum\_num": {  
"sum": {  
"script": "Float.parseFloat(doc['metric\_numerator.keyword'].value)"  
}  
},  
"sum\_den": {  
"sum": {  
"field": "metric\_denominator"  
}  
},  
"avg": {  
"bucket\_script": {  
"buckets\_path": {  
"num\_cy": "sum\_num.value",  
"den\_cy": "sum\_den.value"  
},  
"script": "(params.num\_cy/params.den\_cy\*100)"  
}  
}  
}

}  
}  
}

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [October 28, 2019, 7:58am UTC](https://discuss.elastic.co/t/how-to-use-size-api-in-composite-aggregation-for-unique-terms/201587/2 "2019-10-28T07:58:38Z")

</div>

Closed on October 28, 2019, 7:58am UTC

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