Update indexing speed recommendations around the refresh interval. (#40690)
We now need to update recommendations now that we have introduced the concept of "search idle" shards.
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@ -36,12 +36,24 @@ number of workers is. This can be tested by progressively increasing the
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number of workers until either I/O or CPU is saturated on the cluster.
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number of workers until either I/O or CPU is saturated on the cluster.
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[float]
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[float]
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=== Increase the refresh interval
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=== Unset or increase the refresh interval
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The default <<dynamic-index-settings,`index.refresh_interval`>> is `1s`, which
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The operation that consists of making changes visible to search - called a
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forces Elasticsearch to create a new segment every second.
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<<indices-refresh,refresh>> - is costly, and calling it often while there is
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Increasing this value (to say, `30s`) will allow larger segments to flush and
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ongoing indexing activity can hurt indexing speed.
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decreases future merge pressure.
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By default, Elasticsearch runs this operation every second, but only on
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indices that have received one search request or more in the last 30 seconds.
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This is the optimal configuration if you have no or very little search traffic
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(e.g. less than one search request every 5 minutes) and want to optimize for
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indexing speed.
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On the other hand, if your index experiences regular search requests, this
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default behavior means that Elasticsearch will refresh your index every 1
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second. If you can afford to increase the amount of time between when a document
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gets indexed and when it becomes visible, increasing the
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<<dynamic-index-settings,`index.refresh_interval`>> to a larger value, e.g.
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`30s`, might help improve indexing speed.
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[float]
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[float]
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=== Disable refresh and replicas for initial loads
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=== Disable refresh and replicas for initial loads
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