private FeedException wrapException(Exception e) {
        if (e instanceof FeedException) return (FeedException) e;
        if (e instanceof IOException) {
            return new OperationParseException("Failed to parse document JSON: " + e.getMessage(), e);
        }
        return new FeedException(e);
    }
Same as {@link #feedMany(InputStream, ResultCallback)}, but without a provided {@link ResultCallback} instance.
@see JsonFeeder#feedMany(InputStream, ResultCallback) for details.
vespa-feed-client-api/src/main/java/ai/vespa/feed/client/JsonFeeder.java