I have an elasticsearch query that returns me the correct results in sorted order (the highest relevancy is at the top and is accurate). However, the query also returns me a lot of results and beyond the top 4 or 5, the results seem less relevant.
My question is :
How to set a threshold such that only the most relevant results are returned by the query
You can use the size param in your elasticsearch query to return your configured number of results. So in your example, if you think only top 5 results are relevant for you then, you can set this size param to 5.
Note, As you might know already that elasticsearch results are sorted according to their score already, hence using size 5 means top 5 relevant documents are returned to you.