boolean addPayload(final WriteTxn writeTxn,
                       final LmdbDb db,
                       final boolean complete) {
        final LmdbPayload payload = createPayload(writeTxn, db, complete);
        doPut(payload);
        return payload.isFinalPayload();
    }
Write data from the data store to an output removing them from the datastore as we go as they will be transferred
to another store.

@param output The output to write to.
stroom-query/stroom-query-common/src/main/java/stroom/query/common/v2/LmdbPayloadCreator.java