Not true.
In "true" REST, if you have a "search" endpoint, POSTing to it should create to a resource, which could be a reference to the list of results. The created resource should have its own endpoint (something like `/search/results/:query_id`), and the client could then cache it.
If you don't want to do that, but still want to say you are really following REST, you could have an endpoint to represent your resources (`/products`) and use GET with filter parameters in the query string (`/products?search=my+search+term`)