Depending on the kind of search (catalog or content), you can make different queries.
The Catalog search allows for simple and inclusive queries:
Simple: it does not allow complex conditions with operands (!, AND, OR).
Inclusive: the search results will contain the elements whose names contain the searched text. For instance, if there is a view CUSTOMER and another one DV_CUSTOMER, a search by customer will include both views in its result (as DV_CUSTOMER contains the searched text).
Scheduler Index: they keywords must follow the Apache Lucene Search Syntax.
Elasticsearch: they keywords must follow the Query String Syntax, according to the version of the Elasticsearch server:
Both Scheduler Index and Elasticsearch do not allow to specify the fields to search in. Searches are performed in their default search field.