Metric aggregations (avg, sum, min, max) in Elasticsearch - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to calculate the average of the field "price".

Elasticsearch

{
  "aggs": {
    "average_price": {
      "[1]": {
        "field": "price"
      }
    }
  }
}

Drag options to blanks, or click blank then click option'

Asum

Bavg

Cmin

Dmax

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'sum' instead of 'avg' will calculate the total, not the average.

Using 'min' or 'max' will give the smallest or largest value, not the average.

The avg aggregation calculates the average value of a numeric field.

2fill in blank

medium

Complete the code to calculate the total sum of the field "quantity".

Elasticsearch

{
  "aggs": {
    "total_quantity": {
      "[1]": {
        "field": "quantity"
      }
    }
  }
}

Drag options to blanks, or click blank then click option'

Asum

Bmin

Cavg

Dmax

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'avg' will calculate the average, not the total sum.

Using 'min' or 'max' will return the smallest or largest value, not the sum.

The sum aggregation adds up all values of the specified field.

3fill in blank

hard

Fix the error in the aggregation type to find the minimum value of "age".

Elasticsearch

{
  "aggs": {
    "youngest": {
      "[1]": {
        "field": "age"
      }
    }
  }
}

Drag options to blanks, or click blank then click option'

Aavg

Bsum

Cmin

Dmax

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'max' will give the largest value, not the minimum.

Using 'sum' or 'avg' will not find the minimum value.

The min aggregation finds the smallest value in the field.

4fill in blank

hard

Fill both blanks to calculate the maximum value of "score" and the average of "time".

Elasticsearch

{
  "aggs": {
    "max_score": {
      "[1]": {
        "field": "score"
      }
    },
    "avg_time": {
      "[2]": {
        "field": "time"
      }
    }
  }
}

Drag options to blanks, or click blank then click option'

Amax

Bavg

Csum

Dmin

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up 'min' and 'max' for the score aggregation.

Using 'sum' instead of 'avg' for the time aggregation.

Use max to find the highest score and avg to find the average time.

5fill in blank

hard

Fill all three blanks to calculate the sum of "sales", the minimum of "discount", and the average of "rating".

Elasticsearch

{
  "aggs": {
    "total_sales": {
      "[1]": {
        "field": "sales"
      }
    },
    "lowest_discount": {
      "[2]": {
        "field": "discount"
      }
    },
    "average_rating": {
      "[3]": {
        "field": "rating"
      }
    }
  }
}

Drag options to blanks, or click blank then click option'

Aavg

Bsum

Cmin

Dmax

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping 'min' and 'max' for discount.

Using 'max' instead of 'sum' for sales.

Using 'sum' instead of 'avg' for rating.

Use sum for total sales, min for lowest discount, and avg for average rating.

Practice

1. What does the avg metric aggregation calculate in an Elasticsearch query?

easy

A. The average value of a numeric field across documents

B. The total count of documents matching the query

C. The maximum value of a numeric field

D. The minimum value of a numeric field

Solution

1. Step 1: Understand the purpose of avg aggregation

   The avg aggregation calculates the average (mean) of values in a numeric field.

2. Step 2: Compare with other metric aggregations

   Other aggregations like sum, min, and max calculate total, minimum, and maximum respectively, not average.

3. Final Answer:

   The average value of a numeric field across documents -> Option A

4. Quick Check:

   avg = average value [OK]

Hint: avg means average value, not count or min/max [OK]

Common Mistakes:

• Confusing avg with sum or count
• Thinking avg returns min or max values
• Mixing avg with document count

2. Which of the following is the correct syntax to calculate the sum of the field price in an Elasticsearch aggregation?

easy

A. "aggs": { "total_price": { "sum": { "field": "price" } } }

B. "aggs": { "total_price": { "avg": { "field": "price" } } }

C. "aggs": { "total_price": { "max": { "field": "price" } } }

D. "aggs": { "total_price": { "min": { "field": "price" } } }

Solution

1. Step 1: Identify the aggregation type for sum

   The aggregation type to calculate sum is sum.

2. Step 2: Check the syntax structure

   The correct syntax uses "sum": { "field": "price" } inside aggs.

3. Final Answer:

   "aggs": { "total_price": { "sum": { "field": "price" } } } -> Option A

4. Quick Check:

   sum aggregation syntax = "aggs": { "total_price": { "sum": { "field": "price" } } } [OK]

Hint: sum uses "sum": { "field": "fieldname" } syntax [OK]

Common Mistakes:

• Using avg or max instead of sum
• Missing the field name inside sum
• Wrong nesting of aggregation keys

3. Given this Elasticsearch aggregation query snippet, what will be the output for the max_price aggregation?

{
  "aggs": {
    "max_price": {
      "max": { "field": "price" }
    }
  }
}

Assuming the documents have prices: 10, 25, 7, 30, 15.

medium

A. 25

B. 30

C. 15

D. 10

Solution

1. Step 1: Understand max aggregation

   The max aggregation returns the highest value of the specified field.

2. Step 2: Identify the maximum price from the list

   From the prices 10, 25, 7, 30, 15, the maximum is 30.

3. Final Answer:

   30 -> Option B

4. Quick Check:

   max price = 30 [OK]

Hint: max returns the highest number in the field values [OK]

Common Mistakes:

• Choosing the second highest value instead of max
• Confusing max with avg or sum
• Ignoring the actual field values

4. Identify the error in this Elasticsearch aggregation query that tries to calculate the minimum value of the field age:

{
  "aggs": {
    "min_age": {
      "min": "age"
    }
  }
}

medium

A. The query is missing a "query" section

B. The aggregation name "min_age" is invalid

C. The aggregation type should be "max" instead of "min"

D. The field name should be inside a nested object with key "field"

Solution

1. Step 1: Check the syntax for min aggregation

   The min aggregation requires the field name inside an object with key "field".

2. Step 2: Identify the error in the given query

   The query uses "min": "age" instead of "min": { "field": "age" } which is incorrect syntax.

3. Final Answer:

   The field name should be inside a nested object with key "field" -> Option D

4. Quick Check:

   min aggregation needs "field": "age" [OK]

Hint: Field must be inside { "field": "name" } for metric aggs [OK]

Common Mistakes:

• Passing field name as string directly without object
• Confusing aggregation type names
• Assuming query section is mandatory for aggregation

5. You want to find the average, sum, minimum, and maximum values of the field score using the avg, sum, min, and max aggregations in a single Elasticsearch query. Which aggregation structure correctly achieves this?

hard

A. { "aggs": { "score_metrics": { "metric": [ { "avg": { "field": "score" } }, { "sum": { "field": "score" } } ] } } }

B. { "aggs": { "score_stats": { "stats": { "field": "score" } } } }

C. { "aggs": { "avg_score": { "avg": { "field": "score" } }, "sum_score": { "sum": { "field": "score" } }, "min_score": { "min": { "field": "score" } }, "max_score": { "max": { "field": "score" } } } }

D. { "aggs": { "score": { "avg": { "field": "score" }, "sum": { "field": "score" }, "min": { "field": "score" }, "max": { "field": "score" } } } }

Solution

1. Step 1: Understand how to combine multiple metric aggregations

   Each metric aggregation must be a separate named aggregation inside aggs.

2. Step 2: Analyze each option's structure

   { "aggs": { "avg_score": { "avg": { "field": "score" } }, "sum_score": { "sum": { "field": "score" } }, "min_score": { "min": { "field": "score" } }, "max_score": { "max": { "field": "score" } } } } correctly defines four separate aggregations for avg, sum, min, and max on the field score. { "aggs": { "score_stats": { "stats": { "field": "score" } } } } uses stats which returns all metrics but is not separate aggregations. { "aggs": { "score_metrics": { "metric": [ { "avg": { "field": "score" } }, { "sum": { "field": "score" } } ] } } } and D have invalid syntax or unsupported structures.

3. Final Answer:

   Separate named aggregations for avg, sum, min, and max inside aggs -> Option C

4. Quick Check:

   Multiple metric aggs need separate keys inside aggs [OK]

Hint: Use separate named aggs for each metric under aggs [OK]

Common Mistakes:

• Trying to combine metrics inside one aggregation object
• Using unsupported array or metric keys
• Confusing stats aggregation with separate metric aggs