Aggregation + sorting +pagination in elastic search

Question

I need to do an aggregation + sorting + pagination in one of the indexes.

I learned about internal functionality of Elastic search,

I have 5 total shards, it will sort the individual shards and fetch the result, by default each shard will return in 10 records. Then the 50 records are sorted again and it will fetch the top 10 record since by default size is 10.

ouput:

The aggregated results are returned in separate field named as "aggregations".In order to do pagination in this aggregated data,size and from are not working.

So tired of doing termBuilder.size(500), now the logic was differs as per this link (http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html)

It leads to inaccuracy of data.

Can any one suggest me how to deal with aggregation + pagination.

Answer 1

In elasticsearch, it's not possible to paginate an aggregation. The query will not give accurate results if size is specified. So, the only way to do sorting and pagination is to give size 0 and return all the documents and then, get the required results by accumulating all the results in a list for further operation.