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Elastic Search : 8.0.1
 RestClient restClient = RestClient.builder(
                new HttpHost("localhost", 9200)).build();
        ElasticsearchTransport transport = new RestClientTransport(
                restClient, new JacksonJsonpMapper());
        ElasticsearchClient client = new ElasticsearchClient(transport);
 KnnSearchQuery query = new KnnSearchQuery.Builder().field("image-vector").k(1).numCandidates(100).queryVector(v).build();
        KnnSearchRequest request = new KnnSearchRequest.Builder().knn(query).index("image_similarity_1million").fields("humanid").build();
   client.knnSearch(request,RequestOptions.DEFAULT);