Add docs for issues list Vue refactor

Add docs for refactor behind feature flag `vue_issues_list`
https://gitlab.com/gitlab-org/gitlab/-/issues/322755

doc/user/search/index.md

@@ -32,24 +32,33 @@ in the search field in the upper right corner:
 
 ### Filter issue and merge request lists
 
-> - Filter by Epics was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/195704) in GitLab Ultimate 12.9.
-> - Filter by child Epics was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/9029) in GitLab Ultimate 13.0.
-> - Filter by Iterations was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/118742) in GitLab 13.6. Moved to GitLab Premium in 13.9.
+> - Filtering by epics was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/195704) in GitLab 12.9.
+> - Filtering by child epics was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/9029) in GitLab 13.0.
+> - Filtering by iterations was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/118742) in GitLab 13.6. Moved from GitLab Ultimate to Premium in 13.9.
+> - Filtering by type was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/322755) in GitLab 13.10 [with a flag](../../administration/feature_flags.md) named `vue_issues_list`. Disabled by default.
 
 Follow these steps to filter the **Issues** and **Merge requests** list pages in projects and
 groups:
 
 1. Click in the field **Search or filter results...**.
 1. In the dropdown menu that appears, select the attribute you wish to filter by:
-   - Author
    - Assignee
-   - [Milestone](../project/milestones/index.md)
+   - Author
+   - Confidential
+   - [Epic and child Epic](../group/epics/index.md) (available only for the group the Epic was created, not for [higher group levels](https://gitlab.com/gitlab-org/gitlab/-/issues/233729)).
    - [Iteration](../group/iterations/index.md)
-   - Release
    - [Label](../project/labels.md)
+   - [Milestone](../project/milestones/index.md)
    - My-reaction
-   - Confidential
-   - [Epic and child Epic](../group/epics/index.md) (available only for the group the Epic was created, not for [higher group levels](https://gitlab.com/gitlab-org/gitlab/-/issues/233729)).
+   - Release
+   - Type
+
+     FLAG:
+     On self-managed GitLab, by default filtering by type is not available.
+     To make it available per group, ask an administrator to [enable the feature flag](../../administration/feature_flags.md) named `vue_issues_list`.
+     On GitLab.com, this feature is not available.
+
+   - Weight
    - Search for this text
 1. Select or type the operator to use for filtering the attribute. The following operators are
    available: