presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/index/Indexer.java/Indexer/close
class Indexer:    @Override
    public void close()
    {
        try {
            flush();
            indexWriter.close();
        }
        catch (MutationsRejectedException e) {
            throw new PrestoException(UNEXPECTED_ACCUMULO_ERROR, "Mutation was rejected by server on close", e);
        }
    }