查询全部索引：
代码语言：javascript复制GetAliasesRequest request = new GetAliasesRequest();
GetAliasesResponse getAliasesResponse = restHighLevelClient.indices().getAlias(request,RequestOptions.DEFAULT);
Map<String, Set<AliasMetaData>> map = getAliasesResponse.getAliases();
Set<String> indices = map.keySet();
