private String getDocumentNameWithSuffix(final String prefix) {
    boolean done = false;
    String suffix = StringUtils.EMPTY;
    suffix = nextString(suffix);
    String docName = prefix + suffix;
    do {
      suffix = nextString(suffix);
      docName = prefix + suffix;
    } while(emh.query().from(document).where(document.name.eq(docName)).exists());
    return prefix + suffix;
  }