EXACT_SEARCH_VS_DECRYPT

Search by user attributes (for example firstName, lastName) may use 2 algorithm:

1. Partial match case-insensitive search (enabled by default). This algorithm decrypts each user attribute value and compares it with search phrase. It works fine, but requires a lot of resources.
2. Exact case-insensitive search (more fast and efficient). Enable it when users number > 50-100k. NOTE: firstly should be initialized search index (via dev controller). It should be rebuilded after each change of {encryption_key}.