---
title: assembler bloom-filter cli namespace
description: Build and query the bloom filter used for legacy-URL redirect coverage. 
url: https://docs-v3-preview.elastic.dev/elastic/docs-builder/pull/2927/cli/assembler/bloom-filter
products:
  - Elastic Docs Builder
---

# assembler bloom-filter cli namespace
```bash
docs-builder assembler bloom-filter --help
```

Build and query the bloom filter used for legacy-URL redirect coverage.

## Commands

<page-card>
  Build a bloom filter binary from a local legacy-docs repository.
</page-card>

<page-card>
  Test whether a URL path is recorded in the bloom filter.
</page-card>