add partitionName field (#1120)

Signed-off-by: lentitude2tk <xushuang.hu@zilliz.com>

examples/main/java/io/milvus/v1/BulkWriterExample.java

@@ -518,6 +518,7 @@ public class BulkWriterExample {
         System.out.println("\n===================== import files to milvus ====================");
         MilvusImportRequest milvusImportRequest = MilvusImportRequest.builder()
                 .collectionName(ALL_TYPES_COLLECTION_NAME)
+                .partitionName("")
                 .files(batchFiles)
                 .build();
         String bulkImportResult = BulkImport.bulkImport(url, milvusImportRequest);

src/main/java/io/milvus/bulkwriter/request/import_/MilvusImportRequest.java

@@ -33,5 +33,6 @@ import java.util.List;
 public class MilvusImportRequest extends BaseImportRequest {
     private static final long serialVersionUID = -1958858397962018740L;
     private String collectionName;
+    private String partitionName;
     private List<List<String>> files;
 }