Delete documents using CloudSolrClient:
final String[] solrUrl = { "http://localhost:8983/solr" };
final String collectionName = "collection1";
final CloudSolrClient cloudSolrClient = new CloudSolrClient.Builder(Arrays.asList(solrUrl)).build();
cloudSolrClient.setDefaultCollection(collectionName);
// deleting documents [CloudSolrClient::deleteById]
{
final UpdateResponse updateResponse = cloudSolrClient.deleteById(collectionName, "1");
System.out.println(updateResponse);
}
cloudSolrClient.close();