107989df3e
This change introduces a new feature for indices so that they can be hidden from wildcard expansion. The feature is referred to as hidden indices. An index can be marked hidden through the use of an index setting, `index.hidden`, at creation time. One primary use case for this feature is to have a construct that fits indices that are created by the stack that contain data used for display to the user and/or intended for querying by the user. The desire to keep them hidden is to avoid confusing users when searching all of the data they have indexed and getting results returned from indices created by the system. Hidden indices have the following properties: * API calls for all indices (empty indices array, _all, or *) will not return hidden indices by default. * Wildcard expansion will not return hidden indices by default unless the wildcard pattern begins with a `.`. This behavior is similar to shell expansion of wildcards. * REST API calls can enable the expansion of wildcards to hidden indices with the `expand_wildcards` parameter. To expand wildcards to hidden indices, use the value `hidden` in conjunction with `open` and/or `closed`. * Creation of a hidden index will ignore global index templates. A global index template is one with a match-all pattern. * Index templates can make an index hidden, with the exception of a global index template. * Accessing a hidden index directly requires no additional parameters. Backport of #50452 |
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