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[DOCS] Adds performance considerations section to transforms overview (#53791) 

Co-Authored-By: Lisa Cawley <lcawley@elastic.co>
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István Zoltán Szabó 2020-03-19 17:49:19 +01:00
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docs/reference/transform/overview.asciidoc
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@ -62,3 +62,19 @@ image::images/pivot-preview.jpg["Example of a {transform} pivot in {kib}"]
IMPORTANT: The {transform} leaves your source index intact. It IMPORTANT: The {transform} leaves your source index intact. It
creates a new index that is dedicated to the transformed data. creates a new index that is dedicated to the transformed data.
[[transform-performance]]
==== Performance considerations
{transforms-cap} perform search aggregations on the source
indices then index the results into the destination index. Therefore, a
{transform} never takes less time than the cumulated duration of the
aggregation that it performs and the indexing process.
For better performance, make sure that your search aggregations and queries are
optimized, so they don't process unnecessary data.
NOTE: When you use <<search-aggregations-bucket-datehistogram-aggregation>>, the
queries are not considered optimal as they run through a significant amount of
data. For this reason, {transforms} performing date histogram aggregations take
longer to run.