sPFFramework/src/main/java/it/polimi/spf/framework/search/SearchScheduler.java
void startSearch(QueryInfo queryInfo) {
		Message msg = handler
				.obtainMessage(SearchMessages.SEARCH_STARTED, queryInfo);
		handler.sendMessage(msg);
	}
void startSearch(QueryInfo queryInfo) {
		Message msg = handler
				.obtainMessage(SearchMessages.SEARCH_STARTED, queryInfo);
		handler.sendMessage(msg);
	}
Start a new search.

@param appIdentifier
- the package name of the caller app
@param searchDescriptor
- a descriptor specifying query and settings
@return the identifier of the query