Fixes #124946 ## Summary Takes a step toward optimising our migration paths by only reindexing (an expensive operation) when needed by checking whether the current SO mappings have "changed". By "changed" we mean that we have detected a new md5 checksum of any registered saved object type relative to the hashes we have stored. ## How to test These changes are constrained to the `model.ts`, a test was added for correctly detecting that mappings are the same during the `INIT` phase to send us down the correct migration path. Additionally, we have a new Jest integration test `skip_reindex.test.ts` that runs Kibana and inspects the logs for the expected model transitions. Everything else should remain the same. ## Happy path for skipping reindex ``` RUN INIT IF !versionMigrationIsComplete AND !kibana indexBelongsToLaterVersion AND !waitForMigrationCompletion AND mappingsAreUnchanged THEN the migration operations must target the existing .kibana_x.y.z_001 index RUN PREPARE_COMPATIBLE_MIGRATION (new state) we remove old version aliases (prevent old reads/writes), and set the current version alias (prevent old migrations) SKIP LEGACY_SET_WRITE_BLOCK SKIP ... SKIP SET_SOURCE_WRITE_BLOCK SKIP ... SKIP REFRESH_TARGET RUN OUTDATED_DOCUMENTS_SEARCH_OPEN_PIT ... RUN MARK_VERSION_INDEX_READY DONE ``` ## Notes * This optimisation will only be triggered when there are no mappings changes AND we are upgrading to a new version. This does not cover all cases. In future we will make this more sophisticated by checking for incompatible changes to mappings and only reindexing when those occur. ## Related * #147503 ### Checklist - [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com> Co-authored-by: Gerard Soldevila <gerard.soldevila@elastic.co>

Commits

Commits on Dec 23, 2022

Fix autocommiting from CI (#148066)

[Enterprise Search] Make add domain input full width (#148064)

[Cases] Fix bug with emotion styles (#148065)

[Migrations] Only reindex indices if needed (#147371)

Fix autocommiting from CI (#148066 )

[Enterprise Search] Make add domain input full width (#148064 )

[Cases] Fix bug with emotion styles (#148065 )

[Migrations] Only reindex indices if needed (#147371 )