Top 50 Elasticsearch Interview Questions and Answers
Explain in brief about Elasticsearch? Elasticsearch Apache Lucene search engine is a database that stores retrieve and manages document-oriented and semi-structured data. It provides real-time search and analytics for structured…
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Top 50 Interview Questions and Answers of Elastisearch
Short description about: Elasticsearch is a distributed, free and open search and analytics engine for all types of data, including textual, numerical, geospatial, structured, and unstructured. Elasticsearch is built on…
Read more »Top Elastic search interview questions and answers
What is the main use of Elasticsearch? Elasticsearch is used for a lot of different use cases: “classical” full-text search, analytics store, auto-completer, spell checker, alerting engine, and as a…
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How to use elastic search EC2 discovery plugin?
Problem To increase the performance in Elasticsearch, many times we add new nodes to Elasticsearch cluster and manually change the configuration file with new IP address, etc. so that it…
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Elastic Search Error – Node is started with node.data=false, but has shard data
[2019-07-11T09:59:18,013][ERROR][o.e.b.Bootstrap ] [es-master01] Exception java.lang.IllegalStateException: Node is started with node.data=false, but has shard data: [/home/ec2-user/elasticsearch-7.2.0/data/nodes/0/indices/6XsNftnbSbOnzPK3wOKc 0w/0]. Use ‘elasticsearch-node repurpose’ tool to clean up at org.elasticsearch.env.NodeEnvironment.ensureNoShardData(NodeEnvironment.java:1065) ~[elasticsearch-7.2.0.jar:7.2.0] at org.elasticsearch.env.NodeEnvironment.(NodeEnvironment.java:324) ~[elasticsearch-7.2.0.jar:7.2.0] Solution
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Elastic Search Error – max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
Errors [2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] Solution To make it persistent, you can add this line: $ sudo vi /etc/sysctl.conf…
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Elastic Search Error – max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
Elastic Search Error – max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535] Solution Temporary to the current login session To set ulimit value…
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How to create sample data to perform searches using elastic search?
Step 1 – Go to: http://www.json-generator.com/ Step 2 – Download and save as customers_full.json Step 3 – Open customers_full.json in sublimetext Remove the array brackets Find-Replace },{ with }\n{ in…
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Elastic Search Error – The bulk request must be terminated by a newline
FIX – Add a New line in customers_full.json
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ElasticSearch Error – illegal_argument_exception – Rejecting mapping update to type
########### COMMAND ################# ########### OUTPUT ########### Solution Multiple mapping types are not supported in indices created in 6.0 The ability to have multiple mapping types per index has been removed…
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ElasticSearch Error – Content-Type header [application/x-www-form-urlencoded] is not supported
To fix this, add curl option -H ‘Content-Type: application/json’. This error is due to strict content-type checking introduced in ElasticSearch 6.0 Solution
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Understanding the Update API in Elasticsearch
The update API allows to update(also allows to delete, or ignore the operation). a document based on a script provided. The operation gets the document from the index, runs the…
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Understanding Elasticsearch Index Mapping & Schema
A schema is a description of one or more fields that describes the document type and how to handle the different fields of a document. The schema in Elasticsearch is…
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Find out elastic Search health using _cat/health
To check elasticsearch cluster health by using (CURL) and Cluster API “cat” provieded by elasticsearch The cat API print the info in JSON format, compact and aligned text which is…
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Understanding Elasticsearch Keywords and Terminology
Understanding Elasticsearch Keywords and Terminology Elasticsearch Terminology Description Cluster “A cluster is a collection of one or more nodes (servers) that together holds your entire data and provides federated indexing…
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Crash Course of Elasticsearch in 10 mins
What is Elasticsearch? Elasticsearch is fast, horizontally scalable open source search engine. It provides HTTP API for storing and indexing JSON documents and with default configuration it behaves a little…
Read more »Elasticsearch Web References & Cheatsheet
Elasticsearch official documentation https://www.elastic.co/guide/en/elasticsearch/reference/6.x/index.html Very good Elasticsearch Guide on Github https://github.com/dzharii/awesome-elasticsearch Elasticsearch Official forum https://discuss.elastic.co/ Stackoverflow elasticsearch handlers http://stackoverflow.com/questions/tagged/elasticsearch Jolicode elasticsearch Cheatsheet http://elasticsearch-cheatsheet.jolicode.com/ Elasticsearch DevOpsSchool reference https://www.devopsschool.com/blog/category/elastic-stack/ https://www.devopsschool.com/tutorial/elastic/
Read more »Web GUI tools for Elasticsearch cluster
elasticsearch-head is a web front end for browsing and interacting with an Elastic Search cluster. There are multiple ways of running elasticsearch-head. Running as a plugin of ElasticSearch (this is…
Read more »Understanding REST HTTP method – GET, POST, PUT, HEAD, DELETE in Elasticsearch
REST (Representational State Transfer) was introduced and defined in 2000 by Roy Fielding in his doctoral dissertation. REST is an architectural style for designing distributed systems. It is not a…
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What are the method to interact with Elastic Search?
Elasticsearch provides official clients for several languages—Groovy, JavaScript, .NET, PHP, Perl, Python, and Ruby—and there are numerous community-provided clients and integrations, all of which can be found in There are…
Read more »Log Management Tools using splunk and other alternatives
Splunk Splunk (the product) captures, indexes and correlates real-time data in a searchable repository from which it can generate graphs, reports, alerts, dashboards and visualizations. Splunk aims to make machine…
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