final String json = coordinatorHelper.toJson(map);
        assertNotNull(json);
        assertTrue(json.contains("\"type\":\"heartbeat\""));
        assertTrue(json.contains("\"instanceId\":\"test-instance\""));
        assertTrue(json.contains("\"createdTime\":1000"));
    }

    @Test
    public void test_toJson_emptyMap() {
        final String json = coordinatorHelper.toJson(Map.of());

Shinsuke Sugaya <******@****.***> 1616590537 +0900

Shinsuke Sugaya <******@****.***> 1558588191 +0900

Shinsuke Sugaya <******@****.***> 1614417976 +0900

Johannes Horn <******@****.***> 1754272009 +0200

Johannes Horn <******@****.***> 1754272009 +0200

Johannes Horn <******@****.***> 1754272009 +0200

  url: https://github.com/cun3yt
Mordson:
  login: Mordson
  count: 5
  avatarUrl: https://avatars.githubusercontent.com/u/39025897?u=b94ea96ef35bbe43bc85359cfb31d28ac16d470c&v=4
  url: https://github.com/Mordson
aminkhani:
  login: aminkhani
  count: 5

        }
    }

    /**
     * Escapes a JSON key-value pair.
     * @param key The key.
     * @param value The value.
     * @return The escaped key-value pair.
     */
    protected String escapeJsonKeyValue(final String key, final String value) {
        return "\"" + key + "\":" + escapeJson(value);
    }

    /**
     * Writes a JSON response.
     * @param status The status code.

# backup

# Target files for index backup.
index.backup.targets=fess_basic_config.bulk,fess_config.bulk,fess_user.bulk,system.properties,fess.json,doc.json
# Target log files for index backup.
index.backup.log.targets=click_log.ndjson,favorite_log.ndjson,search_log.ndjson,user_info.ndjson
# Timeout for loading index backup logs.
index.backup.log.load.timeout=60000

# logging

# Application packages for logging.