@ValidDirectoryPath(ensureExistence = true)
    @JsonPropertyDescription("The directory where Stroom will look for datafeed key files. " +
                             "Only used if datafeedKeyAuthenticationEnabled is true." +
                             "If the value is a relative path then it will be treated as being " +
                             "relative to stroom.path.home. " +
                             "Data feed key files must have the extension .json. Files in sub-directories" +
                             "will be ignored.")
    public String getDataFeedKeysDir() {
        return dataFeedKeysDir;
    }
@return True if the passed {@link AuthenticationType} has been configured as enabled for use..
stroom-receive/stroom-receive-common/src/main/java/stroom/receive/common/ReceiveDataConfig.java