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Top 50 Elasticsearch Interview Questions & Answers (2026)
50 Questions
20 Beginner
20 Intermediate
10 Advanced
About Elasticsearch
This technology is widely used in software development and is a frequent topic in technical interviews at companies of all sizes.
What to Expect in a Elasticsearch Interview
Interviews cover both foundational concepts and practical application of this technology, with questions ranging from definitions to architectural decision-making.
How to Use This Guide
Work through questions in order of difficulty to build your understanding progressively. Bookmark challenging questions and revisit them before your interview.
Curated by Tech Baithak Editorial Team · Last updated: May 2026
Beginner
20 questions
Core concepts every Elasticsearch developer must know.
01
What is Elasticsearch and what problems does it solve?
02
What is the ELK stack?
03
How does an Elasticsearch index compare to a database?
04
What is a document in Elasticsearch?
05
What is a field in Elasticsearch and how does it compare to a column?
06
What is a cluster, node, shard, and replica in Elasticsearch?
07
What is a shard and why does it matter in Elasticsearch?
08
What is the difference between primary and replica shards?
09
How do you create an index in Elasticsearch?
10
How do you perform CRUD operations in Elasticsearch via the REST API?
11
What is the Query DSL in Elasticsearch?
12
What is the difference between full-text search and exact match in Elasticsearch?
13
What is an inverted index in Elasticsearch?
14
How does relevance scoring work in Elasticsearch?
15
What is near-real-time search in Elasticsearch?
16
What is Kibana and how does it relate to Elasticsearch?
17
What is a mapping in Elasticsearch?
18
What is dynamic mapping in Elasticsearch?
19
What is an analyzer in Elasticsearch?
20
What are the _id and _source fields in Elasticsearch?
Intermediate
20 questions
Practical knowledge for developers with hands-on experience.
01
What is the difference between query context and filter context in Elasticsearch?
02
What is a bool query in Elasticsearch?
03
What are aggregations in Elasticsearch?
04
What is the difference between text and keyword field types?
05
What are index templates and component templates in Elasticsearch?
06
What is the Reindex API and when would you use it?
07
What is an index alias in Elasticsearch?
08
What is the Scroll API and when should you use it?
09
What is search_after pagination in Elasticsearch?
10
What is the Highlight API in Elasticsearch?
11
What is the difference between nested objects and the object type in Elasticsearch?
12
What is a custom analyzer in Elasticsearch?
13
What is the percolator in Elasticsearch?
14
What are update_by_query and delete_by_query in Elasticsearch?
15
What are ingest pipelines in Elasticsearch?
16
What are geo queries in Elasticsearch?
17
What field data types does Elasticsearch support?
18
What is the parent-child relationship (join field) in Elasticsearch?
19
What is the multi-search (msearch) API in Elasticsearch?
20
What is dynamic mapping templates in Elasticsearch?
Advanced
10 questions
Deep expertise questions for senior and lead roles.
01
What are cluster health states in Elasticsearch and what causes each?
02
What is hot-warm-cold architecture in Elasticsearch?
03
What is Index Lifecycle Management (ILM) in Elasticsearch?
04
What is Cross-Cluster Replication (CCR) and Cross-Cluster Search (CCS)?
05
How do script_score and function_score work for custom relevance?
06
What are Elasticsearch hardware tuning best practices?
07
How do you optimize Elasticsearch indexing throughput?
08
What are circuit breakers in Elasticsearch?
09
What is kNN vector search in Elasticsearch 8.x?
10
What security features does Elasticsearch provide?
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50 questions total