runConcurrentlyMutatedTest(elements(), ops(add(1), nop()), wrap);

    runConcurrentlyMutatedTest(elements(), ops(add(1), remove()), wrap);

    runConcurrentlyMutatedTest(elements(), ops(nop(), add(1)), wrap);

    runConcurrentlyMutatedTest(elements(1), ops(remove(), nop()), wrap);

    runConcurrentlyMutatedTest(elements(1), ops(remove(), add(2)), wrap);

     */
    public static class ApiDeleteResponse extends ApiResponse {
        /**
         * Constructs an empty ApiDeleteResponse.
         */
        public ApiDeleteResponse() {
            // NOP
        }

        /**
         * The number of deleted items.
         */
        protected long count = 1;

        /**
         * Sets the count of deleted items.

# -------
*.classpath
*.project
*.settings
/bin
/subprojects/*/bin
atlassian-ide-plugin.xml
.metadata/

# NetBeans
# --------
.nb-gradle
.nb-gradle-properties

# Vim
# ---
*.sw[nop]

# Emacs
# -----
*~
\#*\#
.\#*

# Textmate
# --------
.textmate

# Sublime Text
# ------------
*.sublime-*

# Draw.io
# -------
*.bkp
*.dtmp

# jEnv
# ----

                        try {
                            buf.append(URLEncoder.encode(String.valueOf(c), Constants.UTF_8));
                        } catch (final UnsupportedEncodingException e) {
                            // NOP
                        }
                    }
                }
                hash = buf.toString();
            } else {
                hash = StringUtil.EMPTY;
            }
        } else {

                    } else {
                        encodedBuf.append(converted);
                    }
                } catch (final UnsupportedEncodingException e) {
                    // NOP
                }
            }
        }

        final String id = encodedBuf.toString();
        return MessageDigestUtil.digest(ComponentUtil.getFessConfig().getIndexIdDigestAlgorithm(), id);
    }