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Add note about retention periods to reindex-upgrade docs

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Clinton Gormley 2016-10-13 12:12:53 +02:00
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docs/reference/setup/reindex_upgrade.asciidoc
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@ -19,6 +19,20 @@ If you are running an Elasticsearch 2.x cluster or older, you have two options:
* Create a new 6.x cluster and use reindex-from-remote to import indices
directly from the 2.x cluster. See <<reindex-upgrade-remote>>.
.Time-based indices and retention periods
*******************************************
For many use cases with time-based indices, you will not need to worry about
carrying old 2.x indices with you to 6.x. Data in time-based indices usually
becomes less interesting as time passes. Old indices can be deleted once they
fall outside of your retention period.
Users in this position can continue to use 5.x until all old 2.x indices have
been deleted, then upgrade to 6.x directly.
*******************************************
[[reindex-upgrade-inplace]]
==== Reindex in place