Search and Fetch Take too much time when upgrade 1.4.1 to 1.7

Elastic Stack Elasticsearch
1

I m facing a problem when i upgraded my elasticsearch to 1.4.1 to 1.7 search and fetch take to much time but elasticsearch status is green and when i reastarted elasticsearch ,it resolve my problem.I don't know why this is happening.

2

How are you measuring what "too much time" is?

3

5

I am adding a error log which is very helpful to understand the problem.
you can download it from here