a) Elasticsearch should not be used as a primary data store. b) PostgreSQL does not compare to Elasticsearch when it comes to full text searching capabilities.

a) Elasticsearch should not be used as a primary data store. b) PostgreSQL does not compare to Elasticsearch when it comes to full text searching capabilities. c) PostgreSQL has no vendor-supported, built-in solution for horizontal scalability which is a big reason why you would choose Elasticsearch over a more lightweight search system.