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There are many many knobs that you can twiddle to customize index behavior, which you can read about in the {ref}/index-modules.html[Index Modules reference documentation], but…
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Tip
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Elasticsearch comes with good defaults. Don’t twiddle these knobs until you understand what they do and why you should change them. |
Two of the most important settings are as follows:
number_of_shardsThe number of primary shards that an index should have,
which defaults to 5. This setting cannot be changed
after index creation.
number_of_replicasThe number of replica shards (copies) that each primary shard
should have, which defaults to 1. This setting can be changed
at any time on a live index.
For instance, we could create a small index—just one primary shard—and no replica shards with the following request:
PUT /my_temp_index
{
"settings": {
"number_of_shards" : 1,
"number_of_replicas" : 0
}
}
Later, we can change the number of replica shards dynamically using the
update-index-settings API as follows:
PUT /my_temp_index/_settings
{
"number_of_replicas": 1
}
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