Feature request - "type" templates

[rore]

Currently it's possible to define an index level template which gets applied when a new index is created, and a default template which is applied to all types.

We see a need for type templates - this is a template that gets applies when a new type is created - even if it's not in the context of a new index.

I'll explain the use case: we have several types in the system, each has a set of fields that needs to be defined every time the type is created.
We define those type in a template that gets applied when indexes are created. But sometimes we need to delete a type (with all its data) and recreate it. When we do that our template is not applied - since it's not a new index - and we need to explicitly put the mapping for the type. It would be much more consistent if we can define a template for the type that would be applied whenever the type is created.

[clintongormley]

Hi @rore

Sorry it has taken a while to get to this one. With #8877 we are planning on removing the ability to delete types, and with #8871 types will essentially become collections of fields whose definition (internally) lives at the index level. These changes remove the need for type templates.