Re-modularizes search facets

[thesuzerain]

Search facets (specifically- the loader field ones) were temporarily hard coded to fix an issue where indexing would halt.

It seems to be because it takes forever (and eventually timesout) during the process of adding these fields to the index. So, this commit:

• increases the timeout ,
• only adds fields that do not already exist (meaning that they dont need to be added in subsequent indexes)

Ideally, on the first index, there will be none or very few entries anyway, so adding the field should be pretty quick and easy.