I've been thinking, could Scalability Pro replace my ElasticSearch setup? I'm also trying to get rid of my ElastiCache for Redis. So I guess my question is, do they all do the same thing?(by "all" meaning Scalability Pro, Redis, and ElasticSearch). Are they trying to accomplish the same goal taking different approaches? And if I were to use Scalability Pro, would wordpress search plugins like JetSearch, SearchWP and Relevanssi be able to find and read it's index map(or data map?)? Thanks in advance for any insight and advice.
Scalability Pro does not generally speed up search operations. It can do, depending on how the postmeta searches are performed, e.g. we add a useable index to meta_value, but for that index to be used the search cannot be a wildcard search.
The plugin you are looking for if you wish to replace Elastic Search is our Super Speedy Search plugin. It replaces normal search with fulltext index search which runs extremely fast.
Super Speedy Search also speeds up many wp-admin searches.