/**
     * Prepares a clear scroll request builder.
     *
     * @return the clear scroll request builder
     */
    @Override
    public ClearScrollRequestBuilder prepareClearScroll() {
        return client.prepareClearScroll();
    }

    /**
     * Clears scroll contexts asynchronously.
     *
     * @param request the clear scroll request
     * @return a future for the clear scroll response

        } finally {
            deleteScrollContext(scrollId);
        }
    }

    protected void deleteScrollContext(final String scrollId) {
        if (scrollId != null) {
            client.prepareClearScroll().addScrollId(scrollId).execute(ActionListener.wrap(() -> {}));
        }
    }

    @Override
    protected Number doReadNextVal() {

        } finally {
            deleteScrollContext(scrollId);
        }
    }

    protected void deleteScrollContext(final String scrollId) {
        if (scrollId != null) {
            client.prepareClearScroll().addScrollId(scrollId).execute(ActionListener.wrap(() -> {}));
        }
    }

    @Override
    protected Number doReadNextVal() {

        } finally {
            deleteScrollContext(scrollId);
        }
    }

    protected void deleteScrollContext(final String scrollId) {
        if (scrollId != null) {
            client.prepareClearScroll().addScrollId(scrollId).execute(ActionListener.wrap(() -> {}));
        }
    }

    @Override
    protected Number doReadNextVal() {