fields.put("PhoneNumber", "NumberLong(" + textField_4.getText() + ")");
mencari dokumen di mana PhoneNumber memiliki nilai "NumberLong(" + textField_4.getText() + ")" bertipe text (String).
Silakan coba ini.
fields.put("PhoneNumber", Long.parseLong(textField_4.getText()));
Dan seperti biasa, tangani pengecualian.