private boolean setsLanguage(Expression expression) {
        SetsLanguageVisitor visitor = new SetsLanguageVisitor();
        visitor.visit(expression);
        return visitor.setsLanguage;
    }
An indexing language script derived from a schema. An indexing script contains a set of indexing
statements, organized in a composite structure of indexing code snippets.

@author bratseth
config-model/src/main/java/com/yahoo/schema/derived/IndexingScript.java