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The Best LIVE Mock Interview - You should go through before Interview

Freshers / Beginner level questions & answers

Ques 1. What is Elasticsearch?

Elasticsearch is a distributed search and analytics engine built on top of Apache Lucene.

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Ques 2. Explain the term 'Index' in Elasticsearch.

An index in Elasticsearch is a collection of documents that share a similar structure and are stored together for efficient searching.

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Ques 3. What is a Document in Elasticsearch?

A document is the basic unit of information in Elasticsearch, represented in JSON format.

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Ques 4. Explain the purpose of the 'Cluster' in Elasticsearch.

A cluster is a collection of nodes that work together and share the same cluster name, forming a single logical unit.

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Ques 5. What is the role of a 'Node' in Elasticsearch?

A node is a single instance of Elasticsearch running within a cluster, storing data and participating in cluster operations.

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Ques 6. Explain the concept of 'Tokenization' in Elasticsearch.

Tokenization is the process of breaking a text into individual terms or tokens, which become searchable in Elasticsearch.

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Ques 7. What is the purpose of the 'Refresh' operation in Elasticsearch?

Refresh makes changes to the index immediately visible for search, but it comes with a performance cost.

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Ques 8. Explain the role of 'Filter' in Elasticsearch queries.

Filters are used to narrow down the search results based on specific criteria without affecting scoring.

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Ques 9. Explain the term 'Bulk API' in Elasticsearch.

The Bulk API allows for the efficient indexing and deletion of multiple documents in a single request.

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Ques 10. What is the purpose of the 'CAT API' in Elasticsearch?

The CAT API provides concise information about the cluster, indices, and nodes in a human-readable format.

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Ques 11. What is Elasticsearch?

Elasticsearch is a distributed search and analytics engine built on top of Apache Lucene. It provides a scalable and real-time search solution.

Example:

GET /index/_search?q=query

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Ques 12. What is a 'Node' in Elasticsearch?

A node is a single instance of Elasticsearch running on a machine. It is part of a cluster and stores data and participates in the indexing and search capabilities of Elasticsearch.

Example:

GET /_cat/nodes?v

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Ques 13. What is the role of the 'Cat' API in Elasticsearch?

The 'Cat' API in Elasticsearch provides concise and human-readable information about the cluster, nodes, indices, and other components. It is useful for monitoring and debugging.

Example:

GET /_cat/indices?v

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Ques 14. What is the purpose of the 'Cluster Health' API in Elasticsearch?

The 'Cluster Health' API provides information about the overall health of the Elasticsearch cluster, including the status of nodes, indices, and other vital statistics.

Example:

GET /_cluster/health

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Ques 15. How can you limit the number of results in an Elasticsearch query?

You can use the 'size' parameter in your query to limit the number of results returned. For example, 'size': 10 will return only 10 documents.

Example:

GET /my_index/_search
{
  "query": {
    "match_all": {}
  },
  "size": 10
}

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 16. Differentiate between a Shard and a Replica in Elasticsearch.

A shard is a basic unit that stores data, while a replica is a copy of a shard for fault tolerance and scalability.

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Ques 17. Explain the purpose of an Analyzer in Elasticsearch.

An analyzer is used to preprocess data during indexing and searching, including tokenization and stemming.

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Ques 18. What is Inverted Index in Elasticsearch?

An inverted index is a data structure used to efficiently map terms to the documents containing them.

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Ques 19. Describe the significance of the 'Mapping' in Elasticsearch.

Mapping defines how documents and their fields are stored and indexed, specifying data types and configurations.

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Ques 20. How does Elasticsearch handle distributed search and indexing?

Elasticsearch distributes data across nodes, allowing for parallel processing and improved performance.

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Ques 21. What is the purpose of the 'Query DSL' in Elasticsearch?

The Query DSL (Domain Specific Language) allows users to define queries and filters using a JSON-like syntax.

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Ques 22. How does Elasticsearch handle schema-less data?

Elasticsearch allows dynamic mapping, automatically inferring field data types based on the inserted documents.

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Ques 23. What is the purpose of the 'Aggregation' framework in Elasticsearch?

Aggregations provide the capability to perform complex analysis and computation on the data.

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Ques 24. How does Elasticsearch handle relevance scoring in search results?

Elasticsearch uses a scoring algorithm based on the relevance of documents to the search query.

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Ques 25. Explain the term 'Mapping Conflict' in Elasticsearch.

Mapping conflict occurs when conflicting field types are encountered during dynamic mapping.

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Ques 26. What is the purpose of the 'Snapshot' and 'Restore' feature in Elasticsearch?

Snapshot and Restore allow for the backup and recovery of an entire cluster or specific indices.

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Ques 27. Describe the 'Search Shards' concept in Elasticsearch.

Search Shards are individual units of a search request distributed across nodes for parallel processing.

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Ques 28. Explain the use of the 'Alias' feature in Elasticsearch.

Aliases are used to provide a permanent and abstract name to an index, simplifying index management and searches.

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Ques 29. What is the purpose of the 'Fielddata' cache in Elasticsearch?

Fielddata cache stores the data structures necessary for sorting and aggregating on fields, improving performance.

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Ques 30. Explain the role of the 'Cluster State' in Elasticsearch.

The Cluster State holds information about the entire cluster, including metadata about indices, nodes, and shards.

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Ques 31. What is the purpose of the 'Recovery' process in Elasticsearch?

Recovery is the process of restoring a shard to a consistent state after a node failure or restart.

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Ques 32. Explain the term 'Fuzzy Query' in Elasticsearch.

A Fuzzy Query is used to find documents that match a specified term with a certain degree of error or similarity.

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Ques 33. What is the purpose of the 'Token Filter' in Elasticsearch?

Token Filters modify the tokens generated during the tokenization process, influencing the search and indexing process.

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Ques 34. Explain the term 'Caching' in Elasticsearch.

Caching involves storing frequently used data to reduce the need for repeated computations, improving performance.

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Ques 35. What is the purpose of the 'Routing' in Elasticsearch?

Routing determines which shard a document should be stored in based on a predefined value, optimizing search performance.

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Ques 36. Explain the concept of an index in Elasticsearch.

An index in Elasticsearch is a collection of documents that share similar characteristics. It is similar to a database in relational databases.

Example:

PUT /my_index

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Ques 37. What is a shard in Elasticsearch?

A shard is a basic unit of storage and search in Elasticsearch. Indexes are divided into shards to distribute data across multiple nodes for scalability.

Example:

PUT /my_index/_settings
{
  "number_of_shards": 5
}

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Ques 38. Explain the purpose of the term 'mapping' in Elasticsearch.

Mapping in Elasticsearch is the process of defining how a document and its fields are stored and indexed. It helps in defining the data type, analysis, and other properties.

Example:

PUT /my_index
{
  "mappings": {
    "properties": {
      "title": { "type": "text" }
    }
  }
}

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Ques 39. Explain the purpose of the 'Analyzer' in Elasticsearch.

An analyzer in Elasticsearch is responsible for processing the text during indexing and searching. It includes a tokenizer and one or more token filters.

Example:

PUT /my_index
{
  "settings": {
    "analysis": {
      "analyzer": {
        "custom_analyzer": {
          "type": "custom",
          "tokenizer": "standard",
          "filter": ["lowercase", "my_custom_filter"]
        }
      }
    }
  }
}

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Ques 40. What is the purpose of the 'Query DSL' in Elasticsearch?

The Query DSL (Domain Specific Language) in Elasticsearch is used to define queries in a JSON format. It allows for complex and flexible querying of data.

Example:

{
  "query": {
    "match": {
      "field": "value"
    }
  }
}

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Ques 41. Explain the 'Bulk' API in Elasticsearch.

The Bulk API in Elasticsearch allows you to index, delete, or update multiple documents in a single request for better performance. It reduces the overhead of handling individual requests.

Example:

POST /my_index/_bulk
{ "index": { "_id": "1" } }
{ "field": "value1" }
{ "delete": { "_id": "2" } }
{ "create": { "_id": "3" } }
{ "field": "value3" }

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Ques 42. How does the 'Geo-Point' type work in Elasticsearch?

The 'Geo-Point' type in Elasticsearch is used to index and search for geographical coordinates, such as latitude and longitude. It enables spatial queries for location-based data.

Example:

PUT /my_index
{
  "mappings": {
    "properties": {
      "location": {
        "type": "geo_point"
      }
    }
  }
}

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Ques 43. Explain the concept of 'Refresh' in Elasticsearch.

The 'Refresh' operation in Elasticsearch makes recent changes to the index immediately visible for search. It is an important aspect for near real-time search.

Example:

POST /my_index/_refresh

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Ques 44. Explain the concept of 'Routing' in Elasticsearch.

Routing in Elasticsearch is the process of determining which shard a document should be stored in. It is based on the document's routing value and helps distribute data evenly.

Example:

PUT /my_index/_doc/1?routing=user123
{
  "field": "value"
}

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Ques 45. Explain the use of the 'Nested' datatype in Elasticsearch.

The 'Nested' datatype in Elasticsearch is used when dealing with arrays of objects. It allows you to query and index objects as separate entities, maintaining the relationships.

Example:

PUT /my_index
{
  "mappings": {
    "properties": {
      "comments": {
        "type": "nested"
      }
    }
  }
}

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Ques 46. How does the 'Fuzzy' query work in Elasticsearch?

The 'Fuzzy' query in Elasticsearch is used to find approximate matches for a given query term. It is useful for handling typos or variations in spelling.

Example:

GET /my_index/_search
{
  "query": {
    "fuzzy": {
      "field": "value",
      "fuzziness": 2
    }
  }
}

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Ques 47. What is the 'Wildcards' query in Elasticsearch used for?

The 'Wildcards' query allows you to perform wildcard-based searches on string fields. It supports '*' for any number of characters and '?' for a single character.

Example:

GET /my_index/_search
{
  "query": {
    "wildcard": {
      "field": "va*lue"
    }
  }
}

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Ques 48. Explain the concept of 'Field Data' in Elasticsearch.

Field Data in Elasticsearch is used to cache field values in memory for better performance. It is essential for aggregations and sorting operations.

Example:

GET /my_index/_search
{
  "aggs": {
    "sum_prices": {
      "sum": {
        "field": "price",
        "format": "doc_values"
      }
    }
  }
}

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Experienced / Expert level questions & answers

Ques 49. How does Elasticsearch handle security?

Elasticsearch provides security features like role-based access control, SSL/TLS encryption, and authentication mechanisms.

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Ques 50. How can you improve the performance of Elasticsearch queries?

Performance can be improved by optimizing mappings, using proper analyzers, and scaling the cluster horizontally.

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Ques 51. How does Elasticsearch handle conflicts during distributed writes?

Elasticsearch uses versioning to handle conflicts during distributed writes, ensuring data consistency.

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Ques 52. How can you handle high availability in Elasticsearch?

High availability can be achieved by configuring multiple nodes, using replicas, and implementing proper failover mechanisms.

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Ques 53. Describe the 'Scripting' feature in Elasticsearch.

Scripting allows users to write custom scripts for advanced calculations, filtering, and scoring in Elasticsearch queries.

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Ques 54. How does Elasticsearch handle conflicts during index updates?

Elasticsearch uses a versioning mechanism to handle conflicts during index updates and ensure consistency.

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Ques 55. What is the role of a filter in Elasticsearch?

Filters in Elasticsearch are used to narrow down the search results based on specific criteria. They are applied to queries to exclude or include documents in the search.

Example:

GET /my_index/_search
{
  "query": {
    "bool": {
      "filter": {
        "range": {
          "price": { "gte": 20 }
        }
      }
    }
  }
}

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Ques 56. How does Elasticsearch achieve high availability?

Elasticsearch achieves high availability through the concept of replication. Each shard has one or more replicas, and if a node fails, its shards can be served by replicas on other nodes.

Example:

PUT /my_index/_settings
{
  "number_of_replicas": 2
}

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Ques 57. What is the purpose of the 'Aggregations' framework in Elasticsearch?

Aggregations in Elasticsearch provide the ability to perform data analysis on the results of a query. They enable you to extract and process aggregated information from the data.

Example:

GET /my_index/_search
{
  "aggs": {
    "average_price": {
      "avg": {
        "field": "price"
      }
    }
  }
}

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Ques 58. How can you secure communication in Elasticsearch?

Communication in Elasticsearch can be secured using HTTPS. You can enable SSL/TLS to encrypt the data transmitted between nodes and clients for secure communication.

Example:

PUT /_cluster/settings
{
  "persistent": {
    "xpack.security.http.ssl.enabled": true
  }
}

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Ques 59. Explain the purpose of the 'Reindex' API in Elasticsearch.

The 'Reindex' API is used to copy documents from one index to another. It is useful for reorganizing data, changing mappings, or upgrading Elasticsearch versions.

Example:

POST _reindex
{
  "source": {
    "index": "old_index"
  },
  "dest": {
    "index": "new_index"
  }
}

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Ques 60. Explain the purpose of the 'Percolator' in Elasticsearch.

The 'Percolator' in Elasticsearch is used for reverse searching. Instead of searching for documents, it allows you to register queries and match them against incoming documents.

Example:

PUT /my_index/_doc/my_percolator_query
{
  "query": {
    "match": {
      "field": "value"
    }
  }
}

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Ques 61. What is the purpose of the 'Script' query in Elasticsearch?

The 'Script' query allows you to execute custom scripts during the search process. It is useful for complex calculations or custom scoring logic.

Example:

GET /my_index/_search
{
  "query": {
    "script": {
      "script": {
        "source": "doc['field'].value > 10"
      }
    }
  }
}

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HR Questions interview questions and answers - Total 49 questions
REST API interview questions and answers - Total 52 questions
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Blockchain interview questions and answers - Total 29 questions
Technical Support interview questions and answers - Total 30 questions
Mainframe interview questions and answers - Total 20 questions
Hadoop interview questions and answers - Total 40 questions
Chemistry interview questions and answers - Total 50 questions
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RPA interview questions and answers - Total 26 questions
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SDLC interview questions and answers - Total 75 questions
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JCL interview questions and answers - Total 20 questions
Ajax interview questions and answers - Total 58 questions
JavaScript interview questions and answers - Total 59 questions
Express.js interview questions and answers - Total 30 questions
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ES6 interview questions and answers - Total 30 questions
Electron.js interview questions and answers - Total 24 questions
RxJS interview questions and answers - Total 29 questions
NodeJS interview questions and answers - Total 30 questions
jQuery interview questions and answers - Total 22 questions
Vue.js interview questions and answers - Total 30 questions
ExtJS interview questions and answers - Total 50 questions
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Shell Scripting interview questions and answers - Total 50 questions
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Linux interview questions and answers - Total 43 questions
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HTML interview questions and answers - Total 27 questions
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GWT interview questions and answers - Total 27 questions
Symfony interview questions and answers - Total 30 questions
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