Fields API Meta Issue

[stu-elastic]

Fields API:

• Support unsigned long

1. Support unsigned long field type in painless #64361
2. Update Painless Fields API design to use mapped types #78950

• Support all basic types

1. Add mapped types to scripting fields api #79105
2. Scripting Fields API for reading #79165
3. Documentation

• Ingest API
• Ingest support for Scripting Fields API #79155
• Source fallback
• Source fallback for Scripting Fields API #79157
• Document skipping
• Allow users to skip documents in the Scripting Fields API #79164
• Document new way of accessing documents
• [DOCS] Add documentation for Painless field API #83388

Related: #61388

[elasticmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)