The Simple Search API method empowers you to make your document searchable with a string query without specifying search parameters.
In the Boolean (advance) search, unlike simple search, you can customize your search by specifying search parameters like - Job Profile, Company, Degree, etc.
Boolean Search gives more flexibility in searching by specifying required/optional search parameters. You can search values for multiple fields with multiple values. You can find the fields list available in Facets for Resume and JD. Multiple values are searched based on the OR conditions. Multiple Fields are searched in the required conditions on the basis of AND condition while in the optional condition it is search with OR condition.