[META FEATURE] Error Prevention Enhancement

[Angie-Zhang]

This Issue tracks planned tasks for Error Prevention Stage 2 Design issue: #432 Stage 1 PR: https://github.com/opensearch-project/index-management/pull/579

Actions:

• [x] Implement index_priority action
• [x] Implement close action #27 Need policy validator
• [x] Implement transition action Need policy validator
• [x] Implement snapshot action
• [x] Implement notification action Need channel's dry-run in policy validator
• [x] Implement shrink action
• [x] Implement allocation action
• [x] Implement rollup action Need policy validator

Explain API and Exception Enhancement:

• [ ] Add troubleshooting link in explain API response when action errors occur (Implementation is available after official doc updates )

Documents:

• [ ] Update the Error Prevention official Document page

Maintenance:

• [ ] Add test cases to cover all condition checks
• [ ] Refactor code structure and logic

[bowenlan-amzn]

In error prevention, we should be able to identify the current stage of the index (hot, warm, cold), some actions are not runnable for warm/cold stage.

Considering enforce adopting the error notification feature, or other effective way of notification when user wants to enable error prevention.