Highlighting matched text in Elasticsearch - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the field to highlight in an Elasticsearch query.

Elasticsearch

{
  "query": {
    "match": {
      "content": "search text"
    }
  },
  "highlight": {
    "fields": {
      "[1]": {}
    }
  }
}

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

Acontent

Btitle

Cauthor

Ddate

Attempts:

3 left

💡 Hint

Common Mistakes

Using a field name different from the one in the query.

Forgetting to specify the field inside the highlight fields.

The highlight section must specify the field name where matches are highlighted. Here, the field is content.

2fill in blank

medium

Complete the code to set the pre-tags for highlighted text in Elasticsearch.

Elasticsearch

{
  "highlight": {
    "pre_tags": ["[1]"],
    "post_tags": ["</em>"],
    "fields": {
      "content": {}
    }
  }
}

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

A<strong>

B<b>

C<mark>

D<em>

Attempts:

3 left

💡 Hint

Common Mistakes

Using tags that do not match the post-tags.

Using tags that are not valid HTML tags.

The pre_tags define the opening tag for highlighted text. Commonly, <em> is used to emphasize matched text.

3fill in blank

hard

Fix the error in the highlight section to correctly specify multiple fields to highlight.

Elasticsearch

{
  "highlight": {
    "fields": {
      "title": {},
      "[1]": {}
    }
  }
}

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

Acontent

Bhighlight

Cmatch

Dfields

Attempts:

3 left

💡 Hint

Common Mistakes

Using reserved keywords like fields or match as field names.

Using invalid field names that do not exist in the index.

To highlight multiple fields, list each field name under fields. Here, content is the second field to highlight.

4fill in blank

hard

Fill both blanks to highlight the field and set the fragment size in Elasticsearch.

Elasticsearch

{
  "highlight": {
    "fields": {
      "[1]": {
        "fragment_size": [2]
      }
    }
  }
}

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

Acontent

Btitle

C150

D50

Attempts:

3 left

💡 Hint

Common Mistakes

Setting fragment_size to a string instead of a number.

Using a field name that does not match the query.

The field to highlight is content. The fragment_size controls the size of the highlighted snippet, here set to 150 characters.

5fill in blank

hard

Fill all three blanks to highlight a field with custom tags and number of fragments.

Elasticsearch

{
  "highlight": {
    "pre_tags": ["[1]"],
    "post_tags": ["[2]"],
    "fields": {
      "content": {
        "number_of_fragments": [3]
      }
    }
  }
}

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

A<em>

B</em>

C3

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching pre and post tags.

Using a string instead of a number for number_of_fragments.

The pre_tags and post_tags define the HTML tags wrapping the highlighted text. The number_of_fragments controls how many highlighted snippets are returned, here 3.