Doc_value overhead in disc space


I'm using elasticsearch 1.4.1, with extensive use of doc-values.

Checking the stats, I have a feeling that there is a large overhead in disc
space - compared to the raw indexed docs size.

My questions are:

  1. is there a way to tell how much disc space is used by the doc-values? I
    didn't find anything in the _stats API.

  2. is there an 'official' value in percentage of doc-value overhead?


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