Filters are the way to select only the indices (or snapshots) you want.

Filter chaining

It is important to note that while filters can be chained, each is linked by an implied logical AND operation. If you want to match from one of several different patterns, as with a logical OR operation, you can do so with the pattern filtertype using regex as the kind.

This example shows how to select multiple indices based on them beginning with either alpha-, bravo-, or charlie-:

  - filtertype: pattern
    kind: regex
    value: '^(alpha-|bravo-|charlie-).*$'

Explaining all of the different ways in which regular expressions can be used is outside the scope of this document, but hopefully this gives you some idea of how a regular expression pattern can be used when a logical OR is desired.

The index filtertypes are:

The snapshot filtertypes are:

You can use environment variables in your configuration files.