[DOCS] Stack updates for security ON by default

[lockewritesdocs]

Security ON by default greatly simplifies security configuration tasks by enabling authentication and authorization by default in the Elastic Stack. This feature requires changes to the documentation for configuring Elasticsearch security, but also for each of the clients (Kibana, Beats, Logstash) that connect to Elasticsearch.

In addition to updating the current documentation, we should integrate security configuration docs for each of the clients into the documentation for configuring security for the Elastic Stack. Consolidating this information into a single location provides a more unified user experience and consistent flow. The documentation for Beats is largely there, but Logstash and Fleet + Agent are still separate.

Alpha documentation

• [ 4D ] Create documentation for alpha1 [DOCS] Security ON by default alpha1 #76052
• [ 1W ] Update documentation for alpha2

Update existing security documentation for the Stack

• [ 2W ] Reconfigure each of the three guides for configuring security for the Elastic Stack
• [ 1W ] Document the process for starting Elasticsearch, enrolling Kibana, and enrolling additional nodes (Enroll Kibana API)
• [ 1W ] Update security configuration for Kibana (in Elastic Stack guide) and update any security-related docs in the Kibana documentation
• [ 1W ] Update documentation for Observability
• [ 1W ] Update documentation for Elastic Security
• [ 2D ] Update documentation for Enterprise Search -- for example, the security settings in this installation guide will no longer need to be set manually. Same for Workplace Search and Enterprise Search.

Update and integrate security documentation for Elastic clients

• [ 1W ] Update security documentation for Beats
• [ 1W ] Update and integrate security documentation for Logstash
• [ 2D ] Integrate Fleet + Agent docs into the Elastic Stack security docs [[DOCS] Integrate Fleet + Agent TLS setup into Stack docs #74640]
• [ 2D ] Create redirects for pages that get integrated into the Elastic Stack security docs

New related features

Enroll Kibana API
elasticsearch-create-enrollment-token tool
elasticsearch-reset-elastic-password tool

[elasticmachine]

Pinging @elastic/es-security (Team:Security)

[lockewritesdocs]

The majority of this work was completed, and we're planning to integrate our security docs across products into a single guide.