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docs(multilingual): add pg_search backend to BM25 selector and comparison table #1824

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nicoloboschi merged 2 commits into from
May 28, 2026
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docs(multilingual): add pg_search backend to BM25 selector and comparison table #1824

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docs(multilingual): add pg_search backend to selector and comparison …
r266-tech May 28, 2026
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docs(multilingual): add pg_search backend to selector and comparison …
r266-tech May 28, 2026
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3 changes: 2 additions & 1 deletion hindsight-docs/docs/developer/multilingual.md
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Expand Up @@ -193,7 +193,7 @@ The semantic (embedding) arm covers cross-lingual matches by meaning. Hindsight

There are two knobs that interact:

- `HINDSIGHT_API_TEXT_SEARCH_EXTENSION` — selects the backend (`native`, `vchord`, `pg_textsearch`, or `pgroonga`).
- `HINDSIGHT_API_TEXT_SEARCH_EXTENSION` — selects the backend (`native`, `vchord`, `pg_textsearch`, `pgroonga`, or `pg_search`).
- `HINDSIGHT_API_TEXT_SEARCH_EXTENSION_NATIVE_LANGUAGE` — selects the PostgreSQL dictionary used by the `native` backend (default: `english`).

Pick the backend based on the languages your bank stores:
Expand All @@ -204,6 +204,7 @@ Pick the backend based on the languages your bank stores:
| `vchord` | Multilingual via `llmlingua2` tokenizer. | Best when you're already using vchord for vector search. |
| `pg_textsearch` | English only (hardcoded). | Industry-standard BM25 ranking + Block-Max WAND. |
| `pgroonga` | **Yes — out of the box.** Single index handles English, CJK, and mixed-script content via the `TokenBigram` polyglot tokenizer + `NormalizerNFKC150` Unicode normalization. | Recommended for non-English / mixed-language banks. Requires the `pgroonga` extension. See `docker/docker-compose/pgroonga/`. |
| `pg_search` | Multilingual via configurable tokenizer (e.g. `chinese_compatible`, `jieba`, `chinese_lindera`, `japanese_lindera`, `korean_lindera`, `ngram`). | ParadeDB `pg_search` extension; the only Citus-compatible BM25 backend. Tokenizer set via `HINDSIGHT_API_TEXT_SEARCH_EXTENSION_PG_SEARCH_TOKENIZER`. See `docker/docker-compose/pg_search/`. |

**Choosing for a single-language bank** (e.g. all Spanish content):
```bash
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3 changes: 2 additions & 1 deletion skills/hindsight-docs/references/developer/multilingual.md
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Original file line number Diff line number Diff line change
Expand Up @@ -193,7 +193,7 @@ The semantic (embedding) arm covers cross-lingual matches by meaning. Hindsight

There are two knobs that interact:

- `HINDSIGHT_API_TEXT_SEARCH_EXTENSION` — selects the backend (`native`, `vchord`, `pg_textsearch`, or `pgroonga`).
- `HINDSIGHT_API_TEXT_SEARCH_EXTENSION` — selects the backend (`native`, `vchord`, `pg_textsearch`, `pgroonga`, or `pg_search`).
- `HINDSIGHT_API_TEXT_SEARCH_EXTENSION_NATIVE_LANGUAGE` — selects the PostgreSQL dictionary used by the `native` backend (default: `english`).

Pick the backend based on the languages your bank stores:
Expand All @@ -204,6 +204,7 @@ Pick the backend based on the languages your bank stores:
| `vchord` | Multilingual via `llmlingua2` tokenizer. | Best when you're already using vchord for vector search. |
| `pg_textsearch` | English only (hardcoded). | Industry-standard BM25 ranking + Block-Max WAND. |
| `pgroonga` | **Yes — out of the box.** Single index handles English, CJK, and mixed-script content via the `TokenBigram` polyglot tokenizer + `NormalizerNFKC150` Unicode normalization. | Recommended for non-English / mixed-language banks. Requires the `pgroonga` extension. See `docker/docker-compose/pgroonga/`. |
| `pg_search` | Multilingual via configurable tokenizer (e.g. `chinese_compatible`, `jieba`, `chinese_lindera`, `japanese_lindera`, `korean_lindera`, `ngram`). | ParadeDB `pg_search` extension; the only Citus-compatible BM25 backend. Tokenizer set via `HINDSIGHT_API_TEXT_SEARCH_EXTENSION_PG_SEARCH_TOKENIZER`. See `docker/docker-compose/pg_search/`. |

**Choosing for a single-language bank** (e.g. all Spanish content):
```bash
Expand Down
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