获取文档的最大数量，如果设置了，需要通过SearchResponse对象里的isTerminatedEarly() 判断返回文档是否达到设置的数量：
SearchResponse
isTerminatedEarly()
SearchResponse sr = client.prepareSearch(INDEX) .setTerminateAfter(1000) //如果达到这个数量，提前终止 .get();if (sr.isTerminatedEarly()) { // We finished early}
SearchResponse sr = client.prepareSearch(INDEX)
.setTerminateAfter(1000) //如果达到这个数量，提前终止
.get();
if (sr.isTerminatedEarly()) {
// We finished early
}
