Match query in Elasticsearch - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Match query?

Given the following Elasticsearch Match query, what documents will be matched if the index contains documents with the field title having values:
1. "Quick brown fox"
2. "Brown fox jumps"
3. "Lazy dog"

Query:

{"query": {"match": {"title": "brown fox"}}}

Elasticsearch

{"query": {"match": {"title": "brown fox"}}}

A Documents 1 and 2 only

B Documents 1, 2, and 3

C Document 2 only

D Document 3 only

💡 Hint

Match query analyzes the input text and looks for documents containing any of the terms after analysis.

The match query analyzes the input 'brown fox' into terms 'brown' and 'fox'. Documents 1 and 2 contain both terms, so they match. Document 3 does not contain either term.

🧠 Conceptual

intermediate

How does the operator parameter affect a Match query?

In an Elasticsearch Match query, what is the effect of setting the operator parameter to and instead of the default or?

A The query matches documents containing none of the terms

B The query matches documents containing all the terms in the query string

C The query matches documents containing any of the terms in the query string

D The query matches documents only if the terms appear in the exact order

💡 Hint

Think about how 'and' changes the condition from 'any' to 'all'.

Setting operator to 'and' means all terms must be present in the document for it to match. The default 'or' matches if any term is present.

🔧 Debug

advanced

Why does this Match query return no results?

Consider this Match query:

{"query": {"match": {"description": {"query": "fast runner", "operator": "and"}}}}

Given documents:
1. {"description": "fast and agile"}
2. {"description": "runner and jumper"}
3. {"description": "fast runner"}

Why does the query return only document 3?

A Because the query string is treated as a phrase and only exact matches are returned

B Because the query is missing a 'match_phrase' type

C Because operator 'and' requires both 'fast' and 'runner' to be present in the same document

D Because the field 'description' is not analyzed

💡 Hint

Check how the 'and' operator affects term matching in documents.

The 'and' operator requires all terms to be present. Documents 1 and 2 have only one of the terms each, so they don't match. Document 3 has both terms.

📝 Syntax

advanced

Identify the syntax error in this Match query

Which option contains a syntax error in the Elasticsearch Match query?

A {"query": {"match": {"content": {"query": "quick fox", "operator": "or"}}}}

B {"query": {"match": {"content": {"query": "quick fox", "fuzziness": "AUTO"}}}}

C {"query": {"match": {"content": "quick fox"}}}

D {"query": {"match": {"content": {"query": "quick fox", "operator": or}}}}

💡 Hint

Check the quotes around string values in JSON.

Option D is invalid JSON because the value or is not quoted, causing a syntax error.

🚀 Application

expert

Which Match query option produces exactly 2 matched documents?

Given an index with documents:
1. {"text": "apple banana cherry"}
2. {"text": "banana cherry"}
3. {"text": "apple cherry"}
4. {"text": "banana apple"}

Which Match query will match exactly documents 1 and 3?

A {"query": {"match": {"text": {"query": "apple cherry", "operator": "and"}}}}

B {"query": {"match": {"text": {"query": "banana cherry", "operator": "and"}}}}

C {"query": {"match": {"text": {"query": "apple banana", "operator": "or"}}}}

D {"query": {"match": {"text": {"query": "apple", "operator": "and"}}}}

💡 Hint

Look for documents containing both 'apple' and 'cherry'.

Option A matches documents containing both 'apple' and 'cherry' which are documents 1 and 3 only.

Practice

1. What does the match query in Elasticsearch primarily do?

easy

A. Updates documents with new values

B. Finds documents with text similar to the search words

C. Deletes documents matching the query

D. Creates a new index for the documents

Solution

1. Step 1: Understand the purpose of match query

   The match query is designed to find documents that contain text similar to the search words provided.

2. Step 2: Differentiate from other operations

   Deleting, updating, or creating indexes are not functions of the match query; it only searches text.

3. Final Answer:

   Finds documents with text similar to the search words -> Option B

4. Quick Check:

   Match query = text search [OK]

Hint: Match query searches text similarity, not modify data [OK]

Common Mistakes:

• Confusing match query with delete or update operations
• Thinking match query creates indexes
• Assuming match query returns exact matches only

2. Which of the following is the correct syntax for a basic match query in Elasticsearch?

easy

A. { "match": { "field": "search text" } }

B. { "match": "field": "search text" }

C. { "match": { "field" = "search text" } }

D. { "match": [ "field", "search text" ] }

Solution

1. Step 1: Review correct JSON structure for match query

   The match query requires a JSON object with the field name as key and the search text as value inside another object.

2. Step 2: Identify syntax errors in options

   { "match": { "field": "search text" } } uses correct JSON with colon separators and nested object. Options A, B, and C have syntax errors like missing braces, wrong assignment, or array usage.

3. Final Answer:

   { "match": { "field": "search text" } } -> Option A

4. Quick Check:

   Correct JSON syntax = { "match": { "field": "search text" } } [OK]

Hint: Match query uses nested JSON with field: text inside match [OK]

Common Mistakes:

• Using equal sign instead of colon
• Missing curly braces around field and text
• Using array instead of object for field and text

3. Given this Elasticsearch query:

{ "query": { "match": { "title": { "query": "quick brown fox", "operator": "and" } } } }

What does the operator": "and" do in this match query?

medium

A. Returns documents containing all the words 'quick', 'brown', and 'fox'

B. Returns documents containing any of the words 'quick', 'brown', or 'fox'

C. Returns documents containing the exact phrase 'quick brown fox'

D. Returns documents containing none of the words

Solution

1. Step 1: Understand the operator option in match query

   The operator 'and' means all words in the query must be present in the document for a match.

2. Step 2: Compare with other operators

   Operator 'or' would return documents with any word, but 'and' requires all words.

3. Final Answer:

   Returns documents containing all the words 'quick', 'brown', and 'fox' -> Option A

4. Quick Check:

   Operator 'and' = all words required [OK]

Hint: Operator 'and' means all words must appear [OK]

Common Mistakes:

• Confusing 'and' with 'or' operator
• Thinking 'and' means exact phrase match
• Ignoring operator option defaults

4. Identify the error in this match query:

{ "query": { "match": { "content": { "query": "data science", "operator": "AND" } } } }

medium

A. The field name 'content' is invalid

B. The query string must be an array, not a string

C. The operator value should be lowercase 'and', not uppercase 'AND'

D. The match query cannot have an operator option

Solution

1. Step 1: Check operator value case sensitivity

   Elasticsearch expects the operator value to be lowercase 'and' or 'or'. Uppercase 'AND' is invalid.

2. Step 2: Validate other parts of the query

   The field name 'content' is valid, query string can be a string, and match query supports operator option.

3. Final Answer:

   The operator value should be lowercase 'and', not uppercase 'AND' -> Option C

4. Quick Check:

   Operator values are lowercase [OK]

Hint: Operator values must be lowercase 'and' or 'or' [OK]

Common Mistakes:

• Using uppercase 'AND' or 'OR' for operator
• Assuming query must be an array
• Thinking operator option is not allowed

5. You want to find documents where the description field contains either the word 'fast' or 'quick', but not necessarily both. Which match query is correct?

hard

A. { "match": { "description": { "query": "fast quick", "operator": "not" } } }

B. { "match": { "description": { "query": "fast quick", "operator": "and" } } }

C. { "match": { "description": "fast OR quick" } }

D. { "match": { "description": { "query": "fast quick", "operator": "or" } } }

Solution

1. Step 1: Understand the operator 'or' in match query

   Operator 'or' returns documents containing any of the words, so either 'fast' or 'quick' or both.

2. Step 2: Evaluate other options

   B requires both words, C searches for documents containing 'fast', 'OR', and 'quick' (treating OR as literal text), D uses invalid operator 'not'.

3. Final Answer:

   { "match": { "description": { "query": "fast quick", "operator": "or" } } } -> Option D

4. Quick Check:

   Use operator 'or' for any word match [OK]

Hint: Use operator 'or' to match any word in query [OK]

Common Mistakes:

• Using 'and' when 'or' is needed
• Using 'OR' in the search text instead of operator
• Using invalid operator like 'not'