In order for the code bellow to work:

► Make sure to update the variables ("solrUrl", "collectionName", ...) with your information.

► Make sure to add the fields "id", "field1", and "field2" to your SchemaXml.

To force the commit, make sure to set the property "openSearcher" to true (SolrConfigXml file -> updateHandler -> autoCommit)

Note: You can also force the commit by running the URL: http://localhost:8983/solr/COLLECTION-NAME/update?commit=true

Add documents using the request handler /update:

final String UPDATE_REQUEST_PATH = "/update";

final String[] solrUrl = { "http://localhost:8983/solr" };

final String collectionName = "collection1";

final String SOLR_UNIQUE_KEY = "id";

final String FIELD_1 = "field1"; // multiValued=true
final String FIELD_2 = "field2";

final String DYNAMIC_FIELD_1 = "dynamicField1_s";
final String DYNAMIC_FIELD_2 = "dynamicField2_s";

final CloudSolrClient cloudSolrClient = new CloudSolrClient.Builder(Arrays.asList(solrUrl)).build();

cloudSolrClient.setDefaultCollection(collectionName);

// adding documents [/update] [UpdateRequest::add] [SolrInputDocument]
{
    final SolrInputDocument solrInputDocument = new SolrInputDocument();

    solrInputDocument.addField(SOLR_UNIQUE_KEY, "2");

    solrInputDocument.addField(DYNAMIC_FIELD_1, "dynamic_field1 1");
    solrInputDocument.addField(DYNAMIC_FIELD_2, "dynamic_field2 1");

    solrInputDocument.addField(FIELD_1, "field1 1");
    solrInputDocument.addField(FIELD_1, "field1 2");

    solrInputDocument.addField(FIELD_2, "field2 1");

    final UpdateRequest updateRequest = new UpdateRequest();

    updateRequest.add(solrInputDocument);
    updateRequest.setPath(UPDATE_REQUEST_PATH);
    updateRequest.setMethod(METHOD.POST);

    final NamedList<Object> response = cloudSolrClient.request(updateRequest);

    System.out.println(response);
}

cloudSolrClient.close();