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As we are moving to single type indices, we need to address this change in security-related indexes. To address this, we are - updating index templates to use preferred type name `_doc` - updating the API calls to use preferred type name `_doc` Upgrade impact:- In case of an upgrade from 6.x, the security index has type `doc` and this will keep working as there is a single type and `_doc` works as an alias to an existing type. The change is handled in the `SecurityIndexManager` when we load mappings and settings from the template. Previously, we used to do a `PutIndexTemplateRequest` with the mapping source JSON with the type name. This has been modified to remove the type name from the source. So in the case of an upgrade, the `doc` type is updated whereas for fresh installs `_doc` is updated. This happens as backend handles `_doc` as an alias to the existing type name. An optional step is to `reindex` security index and update the type to `_doc`. Since we do not support the security audit log index, that template has been deleted. Relates: #38637