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[DOCS] mention automatic cancellation in search docs (#46706) 

Add a small note around automatic search cancellation which was missed as part of #43332

Relates to #43332
This commit is contained in:
Luca Cavanna 2019-09-19 09:34:52 +02:00
parent 3be51fbdf7
commit a6c9f8ffae
1 changed files with 4 additions and 7 deletions
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docs/reference/search.asciidoc
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@ -126,13 +126,10 @@ Setting this value to `-1` resets the global search timeout to no timeout.
=== Search Cancellation
Searches can be cancelled using standard <<task-cancellation,task cancellation>>
mechanism. By default, a running search only checks if it is cancelled or
not on segment boundaries, therefore the cancellation can be delayed by large
segments. The search cancellation responsiveness can be improved by setting
the dynamic cluster-level setting `search.low_level_cancellation` to `true`.
However, it comes with an additional overhead of more frequent cancellation
checks that can be noticeable on large fast running search queries. Changing this
setting only affects the searches that start after the change is made.
mechanism and are also automatically cancelled when the http connection used to
perform the request is closed by the client. It is fundamental that the http
client sending requests closes connections whenever requests time out or are
aborted.
[float]
[[search-concurrency-and-parallelism]]