AWS ES 5.3 officially supports Curator for index managment operations. AWS ES
5.3 does not yet expose the
/_snapshot/_status endpoint Curator uses, and therefore
does not yet support snapshot operations. Older versions of AWS ES are not supported
by Curator versions 4 or 5.
There is some confusion because Curator 3 supported AWS ES, but Curator 4 & 5 do not. There are even some IAM credentials listed as options for client connections. These are currently available, but not able to be used. This may change at some point, so they remain at the ready until then.
Curator 4 & 5 require access to the
/_cluster/state/metadata endpoint in order
to pull metadata at IndexList initialization time for all indices. This
metadata is used to determine index routing information, index sizing, index
close), aliases, and more. Curator 4 switched to
doing this in order to reduce the number of repetitive client calls that were
made in the previous versions. Curator 5 uses the same method.
AWS currently has a 5.3 version of Elasticsearch, which officially supports
Curator for index management operations only. AWS ES does not yet expose the
/_snapshot/status endpoint, which is required by Curator for snapshot management.
Additionally, AWS ES versions 5.1 and older do not fully support the
/_cluster/state/metadata endpoint, which means that Curator cannot be used to
manage indices in AWS if your cluster is version 5.1 or older.