$max

$max returns the maximum field value across matching documents.

If missing is set, missing fields are treated as that value.

Compatibility

Field Type	Supported
TEXT	No
U64/I64/F64	Yes
DATE	Yes
BOOL	Yes
KEYWORD	No
FACET	No

Field must be FAST.

Arguments

Argument	Type	Required	Description
field	string	Yes	Field to aggregate.
missing	number	No	Fallback value for missing fields.

TypeScript

await index.aggregate({
  aggregations: {
    most_expensive: { $max: { field: "price", missing: 0 } },
  },
});

Python

index.aggregate(
    aggregations={"most_expensive": {"$max": {"field": "price", "missing": 0}}}
)

Redis CLI

SEARCH.AGGREGATE products '{}' '{"most_expensive": {"$max": {"field": "price", "missing": 0}}}'

Output

{ "most_expensive": { "value": 80 } }

value can be null when no values are available.