> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# $boost

The `$boost` operator adjusts the relevance score contribution of a field match.
This allows you to prioritize certain matches over others in the result ranking.

### How Boosting Works

Search results are ordered by a relevance score that reflects how well each document matches the query.
By default, all matching conditions contribute equally to this score.
The `$boost` operator multiplies a match's score contribution by the specified factor.

* **Positive values greater than 1** increase the match's importance (e.g., `$boost: 2.0` doubles the contribution)
* **Values between 0 and 1** decrease the match's importance
* **Negative values** demote matches, pushing them lower in results

### Use Cases

* **Prioritize premium content:** Boost matches in title fields over body text
* **Promote featured items:** Give higher scores to promoted products
* **Demote less relevant matches:** Use negative boosts to push certain matches down

### Compatibility

The `$boost` operator can be used with any field type since it modifies the score rather than the matching behavior.

| Field Type  | Supported |
| ----------- | --------- |
| TEXT        | Yes       |
| U64/I64/F64 | Yes       |
| DATE        | Yes       |
| BOOL        | Yes       |
| KEYWORD     | Yes       |
| FACET       | Yes       |

### Examples

<Tabs>
  <Tab title="TypeScript">
    ```ts theme={"system"}
    // Boost matches in $should clauses to prioritize certain terms
    await products.query({
      filter: {
        $must: {
          inStock: true,
        },
        $should: [
          { description: "premium", $boost: 10.0 },
          { description: "quality", $boost: 5.0 },
        ],
      },
    });

    // Demote budget items with negative boost
    await products.query({
      filter: {
        $must: {
          category: "electronics",
        },
        $should: [
          { name: "featured", $boost: 5.0 },
          { description: "budget", $boost: -2.0 },
        ],
      },
    });
    ```
  </Tab>

  <Tab title="Python">
    ```python theme={"system"}
    # Boost matches in $should clauses to prioritize certain terms
    products.query(filter={
        "$must": {"inStock": True},
        "$should": [
            {"description": "premium", "$boost": 10.0},
            {"description": "quality", "$boost": 5.0},
        ],
    })

    # Demote budget items with negative boost
    products.query(filter={
        "$must": {"category": "electronics"},
        "$should": [
            {"name": "featured", "$boost": 5.0},
            {"description": "budget", "$boost": -2.0},
        ],
    })
    ```
  </Tab>

  <Tab title="Redis CLI">
    ```bash theme={"system"}
    # Boost matches in $should clauses to prioritize certain terms
    SEARCH.QUERY products '{"$must": {"inStock": true}, "$should": [{"description": "premium", "$boost": 10.0}, {"description": "quality", "$boost": 5.0}]}'

    # Demote budget items with negative boost
    SEARCH.QUERY products '{"$must": {"category": "electronics"}, "$should": [{"name": "featured", "$boost": 5.0}, {"description": "budget", "$boost": -2.0}]}'
    ```
  </Tab>
</Tabs>