What is Elastic search? Elasticsearch Interview Questions and Answers for Experienced | Code Decode

Elastic search tutorial or what is elastic search in java and why it is very important we have shown in this video of code decode also we have covered most asked elastic search interview questions asked for experienced candidates

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What Is ElasticSearch?
Elasticsearch is a NoSQL database.
ElasticSearch is an open source Search Engine based on Apache Lucene as inverted Text Data structure and it is built with RESTful APIS.

We use it for Storing, searching and Managing
Logs
Search Backend with terrific speed and flexibility.

It mainly consist of
Indexes - similar to Database in relational Terms
Documents - Rows - JSON objects
Fields - Columns

It mainly has Read and write operation. you need to update this as soon as you update the main Database and Read it when FE needs Autocomplete feature.

Why ES ? Most common usage of ElasticSearch?

In Autocomplete in search Box FrontEnd.

If you hit Normal DB then Client will wait for a lot of time till it fetch the data and if it change again in worst case the time doubles again

Such a poor User Experience is not acceptable in User friendly apps.

Hence ElasticSearch came in for the Rescue.

Elasticsearch is a fast, distributed , reliable search engine:

What is a Cluster in Elasticsearch? Explain Node?
Cluster is a collection of single or multiple nodes that holds your entire data and offers centralized indexing and search abilities across all nodes.

A node is an elastic search Instance. It is created when an elasticsearch instance begins.

What is a document in ElasticSearch?
The document is very similar to a row in relational databases. Every document in the index possess different structure but has the same data type for respective fields.

MySQL = Databases = Tables = Columns/Rows

ElasticSearch = Indices = Types = Documents with Properties

Type : Type is a logical index partition whose semantics are dependent upon the user.

An Elasticsearch cluster can contain multiple Indices (databases), which in turn contain multiple Types (tables). These types hold multiple Documents (rows), and each document has Properties(columns). EG = University - (students, teachers, subjects) - all internal details of that type

Hibernate Interview Questions and Answers:

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[sayanbiswas]

Love how you started from basic java interview questions and gradually, steadily moving towards most advanced and important topics. Respect and love to the team of Code Decode.

[thamizhmurasup]

You are a prodigy! I have no words how much your videos helped me for my interviews and learning tech stalks. Keep continuing your phenomenal work for us! Loads of Love and Respect! I am expecting hand on in Elastic Search and Apache Solr!

[gtapril]

Thank u so much so brief and crisp video.

[tarakpavanphanisatyatallur]

Real time project demo
Thanks i understood the core concept of elastic search

[saisubramanian]

Very well explained with enough details to grasp

[thebestofbest-tbob]

Really informative, Please create video for remaining contents also. If created please share the link, I didn't found it.

[pankajkm]

Very important content was uploaded. Thanks for this ELK video and please upload How ELK work, If possible. How to perform a query in elastic search.

[yash]

thank you, great explanation and slides.

[abhishekverma]

Very nice video, nicely completed all the theoretical concepts.
Please create one more video, to show all the coding part and kibana visualisation.

[vipinrathore]

Thanks for such simple explanation. Please create more videos on Elasticsearch.

[prasadareddy-gsxz]

Thank you madam for the brief explanation

[Nexatek]

Very awesome explanation, crystal clear concepts.. but you pronounce SHARDS as SHRADS or SHREDDS

[anupamakushwah]

Love the way you explain topic.Please create a video with the code integration

[onkarjoshi]

Very helpful and easy to understand🙂Please make a video on ElasticSearch Creation demo.

[swapnilchavhan]

Thank you for the amazing videos, please create on the detail of elastic search in details with demo

[sameer]

Mam…I love watching your video…please also make demo video of it

[ruhinapatel]

Mam plz continue your videos on Elastic Search

[vidyashree]

Great explanation! Please do cover the advanced topics. Thanks.

[areshbabu]

Thanks for the amazing content. Please try to cover advanced topics in elastic search.

[pranawkaushal]

Please create one crud operations of elastic search using spring boot
That will be helpful for most of us