This updates the default for the `is_write_index` parameter of the aliases API and create alias API.
The default behavior for `is_write_index` can vary based on:
1. Whether the alias is used for indices or data streams.
2. If an index alias, whether the alias points to multiple indices.
Co-authored-by: James Rodewig <40268737+jrodewig@users.noreply.github.com>
Co-authored-by: 诗心客 <ishixinke@qq.com>
PRs #73062 and #73043 repurposed the `alias` anchor for a new guide for index
and data stream aliases. Previously, this anchor was used for our field alias
documentation.
Repurposing the anchor has caused continuity errors for users selecting
different versions of the ES docs. It could also cause confusion for users with
a `/current/` link to the `alias` page.
This updates the anchor for the alias guide and adds a redirect page to
disambiguate the `alias` anchor.
It also fixes a bread crumb issue for redirects following the 'Modifying your
Data' redirect page.
Closes#77034.
Changes:
* Updates the write index snippet to use data streams
* Notes data streams aliases don't set an implicit write stream, even if the alias points to one data stream.
This allows indexing documents into a data stream alias.
The ingestion is that forwarded to the write index of the data stream
that is marked as write data stream.
The `is_write_index` parameter can be used to indicate what the write data stream is,
when updating / adding a data steam alias.
Relates to #66163
