Range query in Elasticsearch - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a range query in Elasticsearch?

A range query finds documents where a field's value falls within a specified range, like numbers, dates, or strings.

beginner

Which operators can you use in a range query?

You can use gt (greater than), gte (greater than or equal), lt (less than), and lte (less than or equal).

beginner

Show a simple example of a range query to find documents with age between 20 and 30.

{
  "query": {
    "range": {
      "age": {
        "gte": 20,
        "lte": 30
      }
    }
  }
}

beginner

Can range queries be used on date fields in Elasticsearch?

Yes! Range queries work well on date fields to find documents within specific time periods.

beginner

What happens if you use only one operator in a range query, like gt?

The query finds all documents where the field's value is greater than the given value, with no upper limit.

Which operator finds documents with values less than or equal to a number?

A lt

B gte

C lte

D gt

The lte operator means 'less than or equal to'.

What does this range query do? { "range": { "price": { "gt": 100 } } }

A Finds documents with price greater than 100

B Finds documents with price less than 100

C Finds documents with price equal to 100

D Finds documents with price between 0 and 100

The gt operator means 'greater than', so it finds prices above 100.

Can range queries be used on text fields?

A Yes, on any field

B Only on keyword fields

C No, only numeric and date fields

D Only on analyzed text fields

Range queries work on keyword fields (exact values), not on analyzed text fields.

Which operator includes the boundary value in the range?

A gt

B none

C lt

D gte

gte means 'greater than or equal to', so it includes the boundary.

What is the result if you omit all operators in a range query?

A It causes an error

B It returns all documents

C It returns no documents

D It defaults to gt:0

A range query needs at least one operator; otherwise, it is invalid and causes an error.

Explain how to use a range query to find documents with a date field between two dates.

Think about how to specify start and end dates with operators.

Describe the difference between the operators gt and gte in a range query.

Focus on whether the boundary value is included or not.