[Doc][Meta]Logstash 7.10 documentation roadmap

[karenzone]

Doc changes:

• Rework security docs (WIP) Doc:Rework security docs #12225
  • TO DO: Expand content in new section
• Datastreams
• Cloud First work #11530
  • Doc:Relocate logstash-to-cloud topic for increased visibility #11884 - WIP
• Integration plugin docs infrastructure
  • Add new header for Logstash Reference: #11891 and #12163
  • Add new integration plugin header for Versioned Plugin Reference: #891
  • Implement for jdbc: #40
  • Implement for kafka: #46
  • Implement for rabbitmq: #34
• Fix links in response to Beats docs rework
  • Doc:Update links to beats docs logstash-plugins/logstash-input-log4j#46
  • Doc:Update links to beats docs logstash-docs#918 for master with backports to 7.x, 7.9
  • Doc:Fix links to Beats docs for 7.8 logstash-docs#921 for 7.8 with backports to 7.0-7.7, 6.0-6.8, 5.3-5.6
• PQ work
• Formalize process for listing external plugins
  • Doc:Update guidelines for contributing a plugin #12192 - WIP
• Doc:Clarify how Bulk API interacts with DLQ #12209 - WIP
• Doc:Add redirect from multiline filter to multiline codec #12208
• Update ECS versions #1950
• Doc:Stdin input doesn't allow config reloading #12191
• Doc: Offline plugins
• TODO: Add issues from the Logstash 7.10 roadmap

Recurring:

• [Meta]Generate plugin docs [Doc][Meta]Generate and merge plugin docs #11269

Plugins/Plugin quality:

• Doc:Add filter-wurfl to plugin list #908
• [input-elasticsearch]Doc:Update sliced scroll link to resolve to new location #135
• [logstash-filter-split]Doc:Add introductory statement to clarify purpose of plugin #43 and #907
• [logstash-kafka-integration]Doc:Add attribute for kafka client versions #48

Release notes:

• Featured items
• PR: TBD

Process Improvements

• Issue: Plugin docgen with no changes shouldn't be considered a FAILURE #43
• Issue: Restrict Versioned Plugin Ref doc builds to machines equipped with the right set up #22748
  Fix: [logstash-ci] Run periodic Logstash Version Plugin doc build with newer Docker #23030

Ongoing/Other:

• Hardening Guide [Doc]STIG hardening documentation for Logstash #11531 (TBD)
• Doc rebuild initiative workgroup
• Cloud workgroup
• Stack docs workgroup
• GitHub backlog - make continuous improvement by catching up on GitHub issues and PR reviews (ONGOING)