public Builder files(final List<String> files) {
            for (String f : files) {
                final File file = new File(f);
                if (!file.exists()) throw new IllegalArgumentException(new FileNotFoundException(f));
                this.files.add(file);
            }

            return this;
        }
The name of the {@link GremlinScriptEngine} that this module will apply to. Setting no values here will
make the module available to all the engines. Typically, this value should be set as a script's syntax will
be bound to the {@link GremlinScriptEngine} language.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/jsr223/ScriptFileGremlinPlugin.java