field_5ea808b820138 is the field key. This is a unique id given to your field by ACF. Fields are stored as posts, that are a custom post type named acf-field. The information about the field is stored in the post table like any other post type. The settings of the field are in the post and meta values related to the post.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users