ES Java API

/** * 获取所有index */public static Set getAllIndices() {    ActionFuture<IndicesStatsResponse> isr = client.admin().indices().stats(new IndicesStatsRequest().all());    IndicesAdminClient indicesAdminClient = client.admin().indices();    Map<String, IndexStats> indexStatsMap = isr.actionGet().getIndices();    Set<String> set = isr.actionGet().getIndices().keySet();    return set;}