technocratsid

Elasticsearch plugin for Sentiment Analysis

technocratsidOctober 17, 2018January 5, 2019

I have created an Elasticsearch plugin for sentiment-analysis using Stanford CoreNLP libraries. The plugin is compatible with Elasticsearch 6.4.1. Follow the below steps to use this plugin with your elasticsearch...

Java JavaScript

What is Type Safety ?

technocratsidOctober 15, 2018October 15, 2018

Definition Type safety is prevention of typed errors in a programming language. A type error occurs when someone attempts to perform an operation on a value that doesn’t support that operation. In simple...

Java

Example of Java 8 Streams groupingBy feature

technocratsidOctober 13, 2018October 13, 2018

Statement: Let's say you have a list of integers which you want to group into even and odd numbers. Create a list of integers with four values 1,2,3 and 4: List<Integer>...

Elasticsearch

Usage of Index Alias in Elasticsearch

technocratsidOctober 12, 2018

An index alias is another name for an index or group of indices. It can substitute the original index name in any API. Using index alias you can: Create “views” on a...

Elasticsearch

Elasticsearch 6.x Analyzers

technocratsidOctober 11, 2018October 11, 2018

Elasticsearch Analyzer is a wrapper which wraps three functions: Character filter: Mainly used to strip off some unused characters or change some characters. Tokenizer: Breaks a text into individual tokens(or words) based on...

Elasticsearch

Why ES 6.x doesn’t allow multiple types?

technocratsidOctober 11, 2018November 2, 2018

Before Elasticsearch6.x, the analogy wrt Relational Databases was: Relational DB ⇒ Databases ⇒ Tables ⇒ Rows ⇒ Columns Elasticsearch ⇒ Indices ⇒ Types ⇒ Documents ⇒ Fields which led to...

Elasticsearch

How to re-index an index in Elasticsearch using Java ?

technocratsidOctober 11, 2018November 2, 2018

To re-index an index using java, build a re-index request using ReindexRequestBuilder API like: ReindexRequestBuilder reindexRequest = new ReindexRequestBuilder(client,ReindexAction.INSTANCE) .source("source_index") .destination("destination_index") .refresh(true); After creating a request execute the request: reindexRequest.execute();...

Java

Reflections in java

technocratsidOctober 11, 2018October 16, 2018

Reflection is a powerful feature of Java which provides the ability to inspect & modify the code at run time (manipulate internal properties of the program). For example: It's possible for...

Java

Stop the world phase

technocratsidOctober 11, 2018

Garbage Collection literally stops the world. When a GC occurs in young generation space, it is completed quickly as the young generation space is small. Young generation space is the space...

Java

Why Java 8 ?

technocratsidOctober 11, 2018October 11, 2018

In simple words java 8 allows us to write code more precisely and concisely, which is better than writing verbose code in the java versions prior to java 8. Example: Let’s...