[SO Migration] meta list of the possible improvements by area

[pgayvallet]

This is a meta issue to track all the possible improvements for the SO migration, by area

Addressing the causes of the migration failures

• Dynamically adjust batch size to prevent exceeding ES HTTP payload size Migrations should dynamically adjust batch size to prevent failing on 413 errors from Elasticsearch #107641
• Improve the resilience of the algorithm [SO Migration] improve the resilience of the algorithm #104086
• Introduce per-type validation schemas [Saved Objects] introduce per-type validation schemas.  #104088
• Review and validation process for SO migration functions [SO Migration] write an integration test tracking all registered SO types' migrations, mappings, schemas #104100

Minimizing downtime in case of transform failures

• Dry-run migration Dry run migrations #55404
• Interactive migration [Migrations V2] interactive migrations #100685
• Quarantine mode Tag invalid objects instead of failing migrations #55406
• Add a failure hook API [Migrations v2] provide a failure_strategy hook in SO registry for migrations #100687

Improving the migration performance

• Getting rid of the temporary index [SO Migration] increasing performance by getting rid of the temporary index  #104080
• Using distinct indices per type Improve migrations performance by using distinct indices per SO type #104081
• Eventually consistent (aka deferred) migration Eventually consistent saved object/data index migrations #96626

Improving the overall resilience

• Improve the alias detection [SO Migration] Improve the alias detection #105758

Improving the log and error output

• Improve the overall log output [SO Migration] improve the overall log output #104245

Other improvements

• Removing the v1 implementation [Core] Remove v1 migrations #96396
• Allowing type renaming Support for cross-type Saved Object migration #91143
• API to notify that a type is no longer used [SO Migration] add an API to notify that a type is no longer used #104246
• Allow conversion from "global" to "isolated" types [SO Migration] support migrating from "global" to "isolated" types #126191

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)