The open and close index APIs allow to close an index, and later on re-open it. A closed index has almost no overhead on the cluster (except for maintaining its metadata & the disk space it consumes), and is blocked for read/write operations. A closed index can be opened which will then go through the normal recovery process.
open command makes it possible to re-open closed indices in a scripted
$ curator open --help Usage: curator open [OPTIONS] COMMAND [ARGS]... Open indices Options: --help Show this message and exit. Commands: indices Index selection.
Open matching indices:
curator open indices <<index selection parameters>>