private void reduceFieldLiteralBoost(SDField field, Schema schema) {
        SDField literalField = addField(schema, field, "literal",
                                        "{ input " + field.getName() + " | tokenize | index " + field.getName() + "_literal; }",
                                        "literal-boost");
        literalField.setWeight(field.getWeight() + field.getLiteralBoost());
    }
Ensures there are field boosts for all literal boosts mentioned in rank profiles.
This is required because boost indices will only be generated by looking
at field boosts
config-model/src/main/java/com/yahoo/schema/processing/LiteralBoost.java