@Override
                    public FileVisitResult visitFile(final Path file,
                                                     final BasicFileAttributes attrs) {
                        if (Files.isRegularFile(file)) {
                            totalSizeBytes.add(attrs.size());
                            if (LmdbEnvDir.isLmdbDataFile(file)) {
                                storeCount.increment();
                            }
                        }
                        return FileVisitResult.CONTINUE;
                    }
@return The size of all result stores. Assumes no other files are stored in the configured
localDir.
stroom-query/stroom-query-common/src/main/java/stroom/query/common/v2/LmdbDataStoreFactory.java