UpdateRequest up = new UpdateRequest();
up.setAction(ACTION.COMMIT, true, true);
up.deleteByQuery("*:*");
up.process(getSolrCore0());
up.process(getSolrCore1());
up.clear();
// Add something to each core
SolrInputDocument doc = new SolrInputDocument();
doc.setField("id", "AAA");
doc.setField("core0", "yup stopfra stopfrb stopena stopenb");