On the Elasticsearch 5 alpha release , I noticed that something called request cache is highlighted as key release component.
Enable the indices request cache by default #17162 (issues: #16870, #17134)
I went though the discussion and i could not able to understand what this cache was about and how it worked.
Is this same as query cache we had before ? or is it something new and improved.
Kindly point me to some documentation or literature which have explanation on what this is....