In order to search an information respository, a user first needs to discover what search fields are supported by the service.
The service MUST then return the possible search fields to the user, and MAY include instructions.
@param service The service address. @return The possible search fields and instructions or null, if search is not supported. Search fields are supported if they are not null. @throws rocks.xmpp.core.stanza.model.StanzaException If the entity returned a stanza error. @throws rocks.xmpp.core.session.NoResponseException If the entity did not respond.
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