[Fess Site Search](https://github.com/codelibs/fess-site-search) provides [scripts](https://fss-generator.codelibs.org/docs/manual) (see below) to help you migrate from GSS/CSE.
Using the, you can replace existing GSS/CSE JavaScript codes with:

```
<script>
  (function() {
    var fess = document.createElement('script');
    fess.type = 'text/javascript';
    fess.async = true;

    #   o isReplaceSchemaDirectUse: Does it output the data to playsql directly? (NotRequired - Default false)
    #   o isOverrideExistingDataFile: Does it output to existing files? (NotRequired - Default false)
    #   o isSynchronizeOriginDate: Does it synchronize origin date for date adjustment? (NotRequired - Default false)
    #
    ; loadDataReverseMap = map:{
        ; recordLimit = -1

    install|upgrade)

        # Create fess group if not existing
        if ! getent group "$FESS_GROUP" > /dev/null 2>&1 ; then
            echo -n "Creating $FESS_GROUP group..."
            addgroup --quiet --system "$FESS_GROUP"
            echo " OK"
        fi

        # Create fess user if not existing
        if ! id $FESS_USER > /dev/null 2>&1 ; then

        #  And ReplaceSchema task basically ignores this.
        #
        #  Normally this 'except' means no getting meta data for excepted tables.
        #  (so the tables are not existing in SchemaHTML and HistoryHTML and so on).
        #  But you can specify the '@gen' suffix that means generate-only except.
        #  A table with the mark can be treated as documents but no generating classes.
        #