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If you're looking for Elasticsearch Interview Questions, you are at right place. There are lot of opportunities from many reputed companies in the world. Accord…

Elasticsearch Nested Mapping Documents in ElasticSearch can contain properties with arrays or other JSON objects as values. In most cases, this just works. How…

Elasticsearch Multi get While the bulk API enables us create, update and delete multiple documents it doesn’t support retrieving multiple documents at once. We…

BULK API The bulk API makes it possible to perform many index/delete operations in a single API call. This can greatly increase the indexing speed. Client sup…

Post filter The POST_FILTER is applied to the search hits at the very end of a search request, after aggregations have already been calculated. Its purpose is …

A natural extension to aggregation scoping is filtering. Because the aggregation operates in the context of the query scope, any filter applied to the query wil…

Bucket Script Aggregation This functionality is experimental and may be changed or removed completely in a future release. A parent pipeline aggregation, which…

Elasticsearch Aggregations We’ve already seen how we can search with ElasticSearch and get results in the form of hits. However, the _search endpoint offers mo…

Custom Analyzers An analyzer of type CUSTOM that allows to combine a Tokenizer with zero or more Token Filters, and zero or more Char Filters. The custom analy…

Stemming attempts to remove the differences between inflected forms of a word, in order to reduce each word to its root form. For instance, foxes may be reduced…

Mapping Mapping consists of the properties associated with the documents in a specific index type; such as, string, date, integer of each field in that documen…

Mapping MAPPING is the process of defining how a document, and the fields it contains, are stored and indexed. For instance, use mappings to define: which s…

Pagination In the same way as SQL uses the LIMIT keyword to return a single “page” of results, Elasticsearch accepts the from and size parameters: size Indi…

Sort Allows to add one or more sort on specific fields. Each sort can be reversed as well. The sort is defined on a per field level, with a special field name …

Filters Queries and filters have been merged. Any query clause can now be used as a query in “query context” and as a filter in “filter context”. As a general…

Search The search API allows you to execute a search query and get back search hits that match the query. The query can either be provided using a simple query…

Flexible searching and indexing for web applications and sites is almost always useful and sometimes absolutely essential. While there are many complex solution…

CURL Syntax We use HTTP requests to talk to ElasticSearch. A HTTP request is made up of several components such as the URL to make the request to, HTTP verbs (…

ElasticSearch is an open-source and distributed search engine which is very much scalable and supports a good amount of enterprise Search use cases. Introducti…

update API The update API allows to update a document based on a script provided. The operation gets the document (collocated with the shard) from the index, r…

MongoDB vs Elasticsearch There are is nothing wrong to say that databases often play a significant role in the success of a very large number of businesses ope…