Elasticsearch Index is exist or not

[hld942614 (淯誠 鄭)]

How can I know if an index is exist or not?
I am using co.elastic.clients 8.6.2 in Java
below is my code

String index = "test"+ date;
		try {
			ElasticsearchClient client = elasticsearchConfig.getClient();
			SearchResponse<Object> searchResponse = null;
			searchResponse = client.search(s -> s.index(index)
					.sort(sort -> sort.field(f -> f.field("creationDateTime").order(SortOrder.Asc)))
					.size(DEFAULT_SEARCH_RESPONSE_SIZE), Object.class);
			for (Hit<Object> hit : searchResponse.hits().hits()) {
				Object data = hit.source();
				Map<?, ?> map = (Map<?, ?>) data;
				JSONObject jsonObject = new JSONObject(map);
				array.put(jsonObject);
			}
			client._transport().close();
		} catch (Exception e) {
			e.printStackTrace();
		}

Basically I want to check the index is exist or not before I start searching
I found this way might be work

client.indices().exists(ExistsRequest);

But i dont know how to use ExistsRequest，can someone tell me how to use it?

[hld942614 (淯誠 鄭)]

I found how to know the index is exist or not !

ExistsRequest existRequest = ExistsRequest.of(e -> e.index("your_index"));
boolean indexExists = client.indices().exists(existRequest).value();
if(indexExists) {
    System.out.println("Index exist !");
}else {
	System.out.println("Index not exist !");
}

[dadoonet (David Pilato)]

I think you can do this as well (no import required):

if (client.indices().exists(er -> er.index("your_index")).value()) {
    System.out.println("Index exist !");
} else {
    System.out.println("Index not exist !");
}