Usage of Index Alias in Elasticsearch
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 6.x Analyzers
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...
Why ES 6.x doesn’t allow multiple types?
Before Elasticsearch6.x, the analogy wrt Relational Databases was: Relational DB ⇒ Databases ⇒ Tables ⇒ Rows ⇒ Columns Elasticsearch ⇒ Indices ⇒ Types ⇒ Documents ⇒ Fields which led to...
How to re-index an index in Elasticsearch using Java ?
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();...
Reflections in java
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...
Stop the world phase
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...
Why Java 8 ?
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...