How to get distinct value of a field with URI query of elasticsearch and remove size constraint from the URI query

Elastic Stack Elasticsearch
1

If I have redundant data for a field particular field, how do i display the field value only once with URI query of elasticsearch
Plus how can we remove size constraint and get all the indexed data?

2

could anybody please reply to this query?

3

If you want to get all the data then use scan and scroll, not a query.