[keycloak-user] Searching user based on firstName, lastName, etc.

Dear All, On the admin console we can search for a user using their firstName or lastName or a combination of the tow. (GET /admin/realms/{realm}/users) However, when I try using the below code snippet the search does not work as expected. Keycloak kc = Keycloak.getInstance(serverUrl, masterRealm, masterUsername, masterPassword, masterClientId); List<UserRepresentation> userRepresentations = kc.realms().realm(realmName).users().search(username, firstName, lastName, email, firstResult, maxResults); Can anyone please help out how can I search for a user firstName or lastName programmatically in keycloak? -- Thanks and regards, Sajid