import org.elasticsearch.common.hppc.cursors.ObjectObjectCursor; //导入依赖的package包/类
private List<String> findMatchingIndices(String regex) {
	List<String> result = new ArrayList<String>();
	ImmutableOpenMap<String, IndexMetaData> indices = client.admin()
			.cluster().prepareState().execute().actionGet().getState()
			.getMetaData().indices();

	Iterator<ObjectObjectCursor<String, IndexMetaData>> iter = indices
			.iterator();

	while (iter.hasNext()) {
		ObjectObjectCursor<String, IndexMetaData> i = iter.next();
		if (i.key.matches(regex)) {
			result.add(i.key);
		}
	}
	return result;
}
 

import org.elasticsearch.common.hppc.cursors.ObjectObjectCursor; //导入依赖的package包/类
@Test
public void testSwitchAlias() {
    createIndex(INDEX_2);
    client().admin().indices().aliases(Requests.indexAliasesRequest().addAlias(ALIAS, INDEX)).actionGet();

    operations.switchAlias(ALIAS, INDEX, INDEX_2).actionGet();

    GetAliasesResponse response = client().admin().indices().getAliases(new GetAliasesRequest(ALIAS)).actionGet();
    Assertions.assertThat(response.getAliases().size()).isEqualTo(1);
    ObjectObjectCursor<String, List<AliasMetaData>> cursor = response.getAliases().iterator().next();
    Assertions.assertThat(cursor.key).isEqualTo(INDEX_2);
    Assertions.assertThat(cursor.value.size()).isEqualTo(1);
    Assertions.assertThat(cursor.value.iterator().next().alias()).isEqualTo(ALIAS);
}