Elasticsearch can be installed in four easy steps:

1. Download the Elasticsearch packaged in a ZIP  file from https://www.elastic.co/downloads/elasticsearch.
2. Extract Elasticsearch from the ZIP file upon download.
3. Run Elasticsearch from your terminal. Thus, run bin/elasticsearch (bin/elasticsearch.bat on Windows):

After executing bin/elasticsearch in your terminal, Elasticsearch will run on your system:

After running Elasticsearch, you can check if it's functioning properly by running the following command from your terminal:

curl -XGET http://localhost:9200

If everything is set up correctly, you will get a response similar to the following:

{
  "name" : "Df8YuN2",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "Z8SYAKLNSZaMiGkYz7ihfg",
  "version" : {
    "number" : "6.1.1",
    "build_hash" : "bd92e7f",
    "build_date" : "2017-12-17T20:23:25.338Z",
    "build_snapshot" : false,
    "lucene_version" : "7.1.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}