Hi Vikas,
You could go to Settings > Advanced and change discover:sampleSize from the default of 500 to 7000 but use at your own risk. That much data could run your system out of memory or crash something!
But as far as the Chrome plugin getting all the data without you having to scroll down, I'm not sure.
It looks like there have been several attempts to get data from Elasticsearch directly into Excel Here's one;
If it's a static query you need to run often to get latest data, I would try to find a more direct solution like this.
Lee