Configuring Elastic search

1. Installation

Run the following commands to download and setup elastic search on the system

sudo apt-get update

wget https://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/deb/elasticsearch/6.2.4/elasticsearch-6.2.4.deb

sudo dpkg -i elasticsearch-6.2.4.deb

sudo systemctl enable elasticsearch.service

2. Configuring Elasticsearch

Go to /etc/elasticsearch directory and open elasticsearch.yml file.
Configure node name, cluster names, path to the data. Set node.host to 0.0.0.0.

After configuring, run "sudo systemctl restart elasticsearch"

Check the status of elastic search using the following command:
 
curl -X GET 'http://localhost:9200'

3. Create Index

Send a POST request to the elastic search using the following URL with the given request body

URL: host-ip:9200/indiastates

Request Body:
{
  "settings": {
    "number_of_shards": 1,
    "number_of_replicas": 0
  },
  "mappings": {
    "doc": {
      "properties": {
        "Name": {
          "type": "keyword"
        },
        "Population": {
          "type": "integer"
        }
      }
    }
  }
}

4. Create and update documents

Once the index is created, you can create or update documents in this index by sending a POST request.
Eg:

URL: host-ip:9200/indiastates/doc/dl

Request Body:
{
  "Name": "Chhattisgarh",
  "Count": 77578
}