ElasticSearch Java API：客户端创建

Question

我们是否必须为每个操作创建一个 Client 对象，或者在应用程序的生命周期中为所有操作使用唯一的对象？

Answer 1

您可以像 documentation 中解释的那样实例化一个 TransportClient：

TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)
        .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host1"), 9300))
        .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host2"), 9300));

此客户端实例从 AbstractClient 继承所有方法：

admin, bulk, bulk, clearScroll, clearScroll, count, count, delete, 
delete, deleteIndexedScript, deleteIndexedScript, execute, execute, exists,
exists, explain, explain, fieldStats, fieldStats, get, get,
getIndexedScript, getIndexedScript, headers, index, index, multiGet, multiGet, multiPercolate, multiPercolate, multiSearch, multiSearch,
multiTermVectors, multiTermVectors, percolate, percolate, prepareBulk,
prepareClearScroll, prepareCount, prepareDelete, prepareDelete,
prepareDeleteIndexedScript, prepareDeleteIndexedScript, prepareExecute,
prepareExists, prepareExplain, prepareFieldStats, prepareGet,
prepareGet, prepareGetIndexedScript, prepareGetIndexedScript,
prepareIndex, prepareIndex, prepareIndex, prepareMultiGet,
prepareMultiPercolate, prepareMultiSearch, prepareMultiTermVectors,
preparePercolate, preparePutIndexedScript, preparePutIndexedScript,
prepareSearch, prepareSearchScroll, prepareSuggest, prepareTermVector,
prepareTermVector, prepareTermVectors, prepareTermVectors,
prepareUpdate, prepareUpdate, putIndexedScript, putIndexedScript,
search, search, searchScroll, searchScroll, settings, suggest, suggest,
termVector, termVector, termVectors, termVectors, threadPool, update,
update

所以回答你的问题；您可以多次重复使用同一个客户端对象。