private long getDefaultChangelogMinCompactionLagMs() {
    String defaultMinCompactLagConfigName = STORE_PREFIX + "default.changelog." + MIN_COMPACTION_LAG_MS;
    return getLong(defaultMinCompactLagConfigName, DEFAULT_CHANGELOG_MIN_COMPACTION_LAG_MS);
  }
Gets the configured default for stores' changelog min.compaction.lag.ms, or if not defined uses the default
value defined in this class.

@return the default changelog min.compaction.lag.ms
samza-core/src/main/java/org/apache/samza/config/StorageConfig.java