private static ImmutableMap<String, String> convertStatToMap(final Stat stat) {
        return ImmutableMap.<String, String>builder()
                .put("pageSize", Integer.toString(stat.pageSize))
                .put("branchPages", Long.toString(stat.branchPages))
                .put("depth", Integer.toString(stat.depth))
                .put("entries", Long.toString(stat.entries))
                .put("leafPages", Long.toString(stat.leafPages))
                .put("overFlowPages", Long.toString(stat.overflowPages))
                .build();
    }
Deletes {@link LmdbEnv} from the filesystem if it is already closed.
stroom-lmdb/src/main/java/stroom/lmdb/LmdbEnv.java