Fix setting consistency

[MarinPostma]

Summary

There are currently two bugs that need to be addressed regarding setting consistency. The first one concerns the behavior of the wildcard in searchableAttributes and displayedAttributes as thourougly described in #761.
The second is regarding the indexing position of fields registered in the setting before document addition, where the said field are given a position that is not consistent with the order in which they appear in the documents.

Motivations

This will overall improve consistency of the settings and user experience.

Explanation

The idea is to add new fields registered in the settings only in the FieldMap (known fields) and not in the IndexedPosition map, until they are first discovered in a document, and give them a IndexedPosition only then.

The searchableAttributes and displayedAttributes should rely exclusively on the fields present in the IndexedPosition map, when the value is a wildcard.

Related

This is a bug fix and does not have an impact on the documentation