You can type in the search much like you would use Google or any other search field.
spec.weight:>600will list all cars with a weight above 600kg.
Of course, you can combine all of the above things into one query! That might look like the following:
+ferrari -vintage +tags:"semiautomatic" +spec.bhp:>600
Server Manager uses Bleve to provide searching. Bleve is incredibly powerful and offers a great amount of control over search queries. We've covered some examples of how to make the most out of searching here, but please refer to Bleve's Documentation for more detailed examples and syntax.