$boost - Upstash Documentation

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

TypeScript
Python
Redis CLI

// 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 },
    ],
  },
});

# 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},
    ],
})

# 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}]}'

​How Boosting Works

​Use Cases

​Compatibility

​Examples

How Boosting Works

Use Cases

Compatibility

Examples