Elasticsearch – Search Engine

Elasticsearch is a distributed, RESTful search and analytics engine. Part of the Elastic Stack, it enables fast full-text search, log analytics, and real-time application monitoring at scale.

Key Features

• Full-Text Search: Advanced text analysis and relevance
• Distributed: Horizontal scaling and replication
• RESTful API: JSON over HTTP interface
• Aggregations: Complex analytics queries
• Real-Time: Near-instant data availability

Installation

Install Elasticsearch on Ubuntu:

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elasticsearch-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/elasticsearch-keyring.gpg] https://artifacts.elastic.co/packages/8.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-8.x.list
sudo apt update
sudo apt install elasticsearch
sudo systemctl enable elasticsearch

Usage Examples

Elasticsearch operations:

# Index a document
curl -X POST "localhost:9200/products/_doc" -H "Content-Type: application/json" -d'
{
  "name": "Laptop",
  "description": "High performance laptop for developers"
}'

# Search documents
curl -X GET "localhost:9200/products/_search?q=laptop"

# Aggregation query
curl -X GET "localhost:9200/orders/_search" -d'
{
  "aggs": {
    "sales_by_month": {
      "date_histogram": { "field": "date", "interval": "month" }
    }
  }
}'

Benefits

Elasticsearch delivers blazing-fast search and analytics. Its distributed nature ensures high availability while the REST API enables easy integration.

Download Elasticsearch