{"action":"created","comment":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/54723395","id":54723395,"diff_hunk":"@@ -398,3 +398,15 @@ $ curl -XPUT 'http://localhost:9200/twitter/tweet/1?timeout=5m' -d '{\n     \"message\" : \"trying out Elasticsearch\"\n }'\n --------------------------------------------------\n+\n+[float]\n+[[hidden]]\n+=== Hidden Indices\n+\n+An index can be hidden by setting `index.hidden` to `true` when then index is created.\n+A hidden index will not be resolved from expression ie. the index `.scripts` is hidden\n+by default from `5.0` on and won't be deleted if `_all` indices are deleted unless the indices\n+option `include_hidden` is specified. Yet, if the index is specified explitily or via an alias\n+the index is not treated as hidden. This is useful for indices that should not be included if for instance\n+`_all` is searched or if indices are currently re-indexed and follow some kind of index name pattern. This\n+setting can be updated.","path":"docs/reference/docs/index_.asciidoc","position":15,"original_position":15,"commit_id":"34a98c0ec66598318ff57fb16c0002968ae1f933","original_commit_id":"34a98c0ec66598318ff57fb16c0002968ae1f933","user":{"login":"clintongormley","id":56599,"avatar_url":"https://avatars.githubusercontent.com/u/56599?v=3","gravatar_id":"","url":"https://api.github.com/users/clintongormley","html_url":"https://github.com/clintongormley","followers_url":"https://api.github.com/users/clintongormley/followers","following_url":"https://api.github.com/users/clintongormley/following{/other_user}","gists_url":"https://api.github.com/users/clintongormley/gists{/gist_id}","starred_url":"https://api.github.com/users/clintongormley/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/clintongormley/subscriptions","organizations_url":"https://api.github.com/users/clintongormley/orgs","repos_url":"https://api.github.com/users/clintongormley/repos","events_url":"https://api.github.com/users/clintongormley/events{/privacy}","received_events_url":"https://api.github.com/users/clintongormley/received_events","type":"User","site_admin":false},"body":"How about this:\r\n\r\n    [float]\r\n    [[hidden-indices]]\r\n    === Hidden Indices\r\n\r\n    added[5.0.0]\r\n\r\n    An index can be hidden by setting `index.hidden` to `true`. This setting\r\n    defaults to `false` unless the index name starts with `.`, such as `.kibana`.\r\n    This is a dynamic setting which can be updated on an existing index.\r\n\r\n    A hidden index will not be returned by multi-index expressions like `_all`, `*`,\r\n    or `.marvel-*`. For instance, deleting `_all` indices will not delete hidden\r\n    indices. Hidden indices can be referenced directly by name (eg `.kibana`) or\r\n    by an alias that points to the index (eg `marvel-current`).\r\n\r\n    Hidden indices can be revealed by including the `include_hidden` query string\r\n    parameter, such as:\r\n\r\n    [source,js]\r\n    --------------------\r\n    DELETE /_all?include_hidden\r\n    --------------------\r\n\r\n    or:\r\n\r\n    [source,js]\r\n    --------------------\r\n    GET .marvel-*/_count?include_hidden\r\n    --------------------\r\n\r\n","created_at":"2016-03-02T13:43:20Z","updated_at":"2016-03-02T13:43:20Z","html_url":"https://github.com/elastic/elasticsearch/pull/16904#discussion_r54723395","pull_request_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/16904","_links":{"self":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/54723395"},"html":{"href":"https://github.com/elastic/elasticsearch/pull/16904#discussion_r54723395"},"pull_request":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/16904"}}},"pull_request":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/16904","id":61390697,"html_url":"https://github.com/elastic/elasticsearch/pull/16904","diff_url":"https://github.com/elastic/elasticsearch/pull/16904.diff","patch_url":"https://github.com/elastic/elasticsearch/pull/16904.patch","issue_url":"https://api.github.com/repos/elastic/elasticsearch/issues/16904","number":16904,"state":"open","locked":false,"title":"Introduce the notion of hidden indices","user":{"login":"s1monw","id":973334,"avatar_url":"https://avatars.githubusercontent.com/u/973334?v=3","gravatar_id":"","url":"https://api.github.com/users/s1monw","html_url":"https://github.com/s1monw","followers_url":"https://api.github.com/users/s1monw/followers","following_url":"https://api.github.com/users/s1monw/following{/other_user}","gists_url":"https://api.github.com/users/s1monw/gists{/gist_id}","starred_url":"https://api.github.com/users/s1monw/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/s1monw/subscriptions","organizations_url":"https://api.github.com/users/s1monw/orgs","repos_url":"https://api.github.com/users/s1monw/repos","events_url":"https://api.github.com/users/s1monw/events{/privacy}","received_events_url":"https://api.github.com/users/s1monw/received_events","type":"User","site_admin":false},"body":"With the setting `index.hidden` an index can be marked as hidden which\r\nprevents the index from being resolved in index expressions or with `_all` / `*`.\r\nYet, if the index is access explicitly or the expression resolves to an alias pointing\r\nto a hidden index the index is accessible. This is mainly a use case to prevent accidential\r\naccess of a metadata or cluster private index from an ordinary 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