chore: update README.md

Author: actions-user

README.md

@@ -160,6 +160,7 @@ Here are automated tests for the complete example using [bats](https://github.co
 |------|-------------|------|---------|:--------:|
 | <a name="input_additional_tag_map"></a> [additional\_tag\_map](#input\_additional\_tag\_map) | Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`.<br/>This is for some rare cases where resources want additional configuration of tags<br/>and therefore take a list of maps with tag key, value, and additional configuration. | `map(string)` | `{}` | no |
 | <a name="input_advanced_options"></a> [advanced\_options](#input\_advanced\_options) | Key-value string pairs to specify advanced configuration options | `map(string)` | `{}` | no |
+| <a name="input_advanced_security_options_anonymous_auth_enabled"></a> [advanced\_security\_options\_anonymous\_auth\_enabled](#input\_advanced\_security\_options\_anonymous\_auth\_enabled) | Whether Anonymous auth is enabled. Enables fine-grained access control on an existing domain | `bool` | `false` | no |
 | <a name="input_advanced_security_options_enabled"></a> [advanced\_security\_options\_enabled](#input\_advanced\_security\_options\_enabled) | AWS Elasticsearch Kibana enchanced security plugin enabling (forces new resource) | `bool` | `false` | no |
 | <a name="input_advanced_security_options_internal_user_database_enabled"></a> [advanced\_security\_options\_internal\_user\_database\_enabled](#input\_advanced\_security\_options\_internal\_user\_database\_enabled) | Whether to enable or not internal Kibana user database for ELK OpenDistro security plugin | `bool` | `false` | no |
 | <a name="input_advanced_security_options_master_user_arn"></a> [advanced\_security\_options\_master\_user\_arn](#input\_advanced\_security\_options\_master\_user\_arn) | ARN of IAM user who is to be mapped to be Kibana master user (applicable if advanced\_security\_options\_internal\_user\_database\_enabled set to false) | `string` | `""` | no |