Context:
We have different DTO (data transfer objects) for different purposes. For instance, the Indexable*Dto is for storing data in ElasticSEarch and the Rest*Dto is for the rest layer communication. The remaining DTO's without a prefix are often used for either or.

AT:

• Rename `Indexable*Dto` to `EsDto` and put it into a dedicated package to make clear that those Dto's are only there for communication with ElasticSearch