I want to know why the class EnableAllocationDecider has a setting called cluster.routing.allocation.enable which end with "enable", while class IndicesService has setting indices.id_field_data.enabled which end with "enabled".
Are there any rules for naming these configurations?
That very likely is a design decision from many years ago. Feel free to open a github issue to unify these kind of settings.
OK， I'll do it. Which one do you think is more reasonable? I prefer to “enable”
On top of my head I'd say that enabled is more common, but feel free to leave that to the development team in the GitHub issue.