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[DOCS] Add note that write indices are not replicated #82997

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merged 3 commits into from
Jan 28, 2022
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[DOCS] Add note that write indices are not replicated #82997

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ede1fe8
[DOCS] Add note that write indices are not replicated
Jan 24, 2022
9b5260f
Clarify note about is_write_index
Jan 28, 2022
d59bda2
Clarify leader aliases with is_write_index
Jan 28, 2022
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5 changes: 5 additions & 0 deletions docs/reference/ccr/index.asciidoc
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Expand Up @@ -195,6 +195,11 @@ You can't manually modify a follower index's mappings or aliases. To make
changes, you must update the leader index. Because they are read-only, follower
indices reject writes in all configurations.

NOTE: Although changes to aliases on the leader index are replicated to follower
indices, write indices are ignored. Follower indices can't accept direct writes,
so if any leader aliases have `is_write_index` set to `true`, that value is
forced to `false`.

For example, you index a document named `doc_1` in Datacenter A, which
replicates to Datacenter B. If a client connects to Datacenter B and attempts
to update `doc_1`, the request fails. To update `doc_1`, the client must
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