dbTokens.removeAll(query);
dbTokens.removeAll(null, query);
    public void dropIndex(Collection collection) {        final WordRef value = new WordRef(collection.getId());        final IndexQuery query = new IndexQuery(IndexQuery.TRUNC_RIGHT, value);                    final Lock lock = dbTokens.getLock();        try {            lock.acquire(Lock.WRITE_LOCK);            dbTokens.removeAll(query);        } catch (LockException e) {            LOG.warn("Failed to acquire lock for '" + dbTokens.getFile().getName() + "'", e);        } catch (BTreeException e) {            LOG.error(e.getMessage(), e);        } catch (IOException e) {            LOG.error(e.getMessage(), e);        } finally {            lock.release(Lock.WRITE_LOCK);        }    }