public final void setMultipartCopyPartSize(Long multipartCopyPartSize) {
        this.multipartCopyPartSize = multipartCopyPartSize;
    }
Sets the minimum size in bytes of each part when a multi-part copy operation is carried out.
Decreasing the minimum part size will cause a large number of copy part requests being
initiated.

@param multipartCopyPartSize New minimum threshold for copy part size
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/transfer/TransferManagerBuilder.java