[8.6] Stop suggesting feature migrations for 7.x indices (#93666) #93708
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* Don't report MIGRATION_NEEDED for 7.x indices Eventually, we will need to migrate 7.x indices to 8.x before doing a significant upgrade of Lucene. However, the migrations to 8.x are not adequately tested: while they will eventually be needed, they are not currently needed, and may in fact produce bugs. This change will ensure that the GET _migration/system_feature API returns NO_MIGRATION_NEEDED in 8.x. We will begin to require migrations once we start testing for the next major version upgrade.
williamrandolph
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:Core/Infra/Core
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Backports the following commits to 8.6: