On 8.12.0 I am hitting this again
`
Unable to create component template
updating component template [metrics-mysql.performance@custom] results in invalid composable template [metrics-mysql.performance] after templates are merged
`
Before in Upgrading component template logs-settings failed after update to 8.9 路 Issue #98247 路 elastic/elasticsearch 路 GitHub it was the mapping of @timestamp field
Now there seems to be something else