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[DOCS] Add rollups to `Tune for disk usage` (#60436) (#60542) 

Co-authored-by: Leaf-Lin <39002973+Leaf-Lin@users.noreply.github.com>
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James Rodewig 2020-07-31 16:10:57 -04:00 committed by GitHub
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@ -184,3 +184,11 @@ structure, fields, and values together should improve the compression ratio.
Due to the fact that multiple documents are compressed together into blocks, Due to the fact that multiple documents are compressed together into blocks,
it is more likely to find longer duplicate strings in those `_source` documents it is more likely to find longer duplicate strings in those `_source` documents
if fields always occur in the same order. if fields always occur in the same order.
[discrete]
[[roll-up-historical-data]]
=== Roll up historical data
Keeping older data can useful for later analysis but is often avoided due to
storage costs. You can use data rollups to summarize and store historical data
at a fraction of the raw data's storage cost. See <<xpack-rollup>>.