JSON doesn't have a date type. Yet ElasticSearch can automatically map date fields for us. While this "just works" most of the time, it can be a good idea to help ElasticSearch help us by instead using naming conventions for dates. Here's why, and how.
There's one situation where we need to help ElasticSearch to understand the structure of our data in order to be able to query it fully - when dealing with arrays of complex objects.
