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6 changes: 6 additions & 0 deletions docs/reference/migration/migrate_6_3.asciidoc
Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,12 @@ accept these permissions either by keeping standard input open and attaching a
TTY (i.e., using interactive mode to accept the permissions), or by passing the
`--batch` flag.

==== Implementing custom realms with SPI instead of XPackExtension

The legacy `XPackExtension` extension mechanism has been removed and replaced
with an SPI based extension mechanism that is installed and built as an
elasticsearch plugin. For more information about using SPI loaded security extensions in custom realms, see {stack-ov}/custom-realms.html[Integrating with other authentication systems].

[[breaking_63_settings_changes]]
=== Settings changes

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