Following is the code in one of my spring controller.In this I need to store some data in postgres database with multithreading so I don't have wait until it saves data into database and I can send response back to called API.How can I achieve this?

//billingLogService.saveBillingLogDetails(Object);
if (!Util.isNull(personId) && !Util.isNull(personConnectionData)) {
    return new Callable<Map<Long, PersonConnectionTo>>() {
        @Override
        public Map<Long, PersonConnectionTo> call() throws Exception {
            Map<Long, PersonConnectionTo> connectionTextMap =
                profileService.getconnectionTextForFocusCompany(focusCompanyId, personId, personConnectionData);
            return connectionTextMap;
        }
    };
}