How to check if plugin is working?

Hi.
I installed the plugin yesterday ,and it seems not working.How to check if the plugin work or not??
I installed the elastic search engine in my localhost already , and it works fine.
I add the host for elastic search engine, and I sync the database,and check every thing .
How I can test if the data return from elastic not mysql?
System:
wordpress version : 4.9.4
mac pro laptop.
apache2