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Remove bound on SEARCH_COORDINATION default size #98264

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DaveCTurner
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Today by default the SEARCH_COORDINATION pool is sized at half the
allocated processors, or five if there are more than ten CPUs. Yet, if
we scale up a node to have more than ten CPUs, we probably want to scale
up the number of search coordination threads to match. This commit
removes the limit of five threads.

Today by default the `SEARCH_COORDINATION` pool is sized at half the
allocated processors, or five if there are more than ten CPUs. Yet, if
we scale up a node to have more than ten CPUs, we probably want to scale
up the number of search coordination threads to match. This commit
removes the limit of five threads.
@DaveCTurner DaveCTurner added >non-issue :Search/Search Search-related issues that do not fall into other categories v8.10.0 labels Aug 7, 2023
@DaveCTurner DaveCTurner requested review from quux00 and javanna August 7, 2023 14:02
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github-actions bot commented Aug 7, 2023

Documentation preview:

@elasticsearchmachine elasticsearchmachine added the Team:Search Meta label for search team label Aug 7, 2023
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Pinging @elastic/es-search (Team:Search)

@DaveCTurner
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Relates to #98209 and #98124. There's no science here (the factor of ½ is itself questionable) but I'm pretty sure we don't want the max-5 limit any more.

@DaveCTurner DaveCTurner merged commit 847ec45 into elastic:main Aug 8, 2023
@DaveCTurner DaveCTurner deleted the 2023/08/07/SEARCH_COORDINATION-sizing branch August 8, 2023 06:09
@DaveCTurner DaveCTurner restored the 2023/08/07/SEARCH_COORDINATION-sizing branch June 17, 2024 06:17
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