public MockStoreKeyConverterFactory setReturnInputIfAbsent(boolean returnInputIfAbsent) {
    returnKeyIfAbsent = returnInputIfAbsent;
    return this;
  }
Sets whether produced StoreKeyConverters will return the input key if it is absent from the underlying map. If
false, the StoreKeyConverter will return null for missing inputs

@param returnInputIfAbsent
@return
ambry-test-utils/src/main/java/com/github/ambry/store/MockStoreKeyConverterFactory.java