throw new IllegalArgumentException("Unknown source [" + source + "]");
        }
        fetchContext = new FetchSourceContext(
            true,
            Strings.splitStringByCommaToArray(includes),
            Strings.splitStringByCommaToArray(excludes)
        );
        includesSet = Set.of(fetchContext.includes());
        excludesSet = Set.of(fetchContext.excludes());