Macにelasticsearchをインストール

##JDKインストール
$ brew cask install homebrew/cask-versions/java8

##elasticsearchインストール

$ brew update
$ brew install elasticsearch

$  brew info elasticsearch

elasticsearch: stable 6.2.4, HEAD
Distributed search & analytics engine
https://www.elastic.co/products/elasticsearch
/usr/local/Cellar/elasticsearch/6.2.4 (112 files, 30.8MB) *
  Built from source on 2018-08-11 at 01:40:17
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/elasticsearch.rb
==> Requirements
Required: java = 1.8 ✔
==> Options
--HEAD
	Install HEAD version
==> Caveats
Data:    /usr/local/var/lib/elasticsearch/elasticsearch_hitoshimurakami/
Logs:    /usr/local/var/log/elasticsearch/elasticsearch_hitoshimurakami.log
Plugins: /usr/local/var/elasticsearch/plugins/
Config:  /usr/local/etc/elasticsearch/

To have launchd start elasticsearch now and restart at login:
  brew services start elasticsearch
Or, if you don't want/need a background service you can just run:
  elasticsearch

##パスを通す←今回はパス通す必要がなかったのでやめました。

vim ~/.bash_profile

bash_profile
export ELASTICPATH=/usr/local/var/elasticsearch/plugins/
export PATH=$PATH:$ELASTICPATH

##elasticsearch起動

$ cd /usr/local/Cellar/elasticsearch/6.2.4
$ bin/elasticsearch

実行確認。curlしてjsonが正常に返ってきた。

MacBook-Pro:6.2.4 hitoshimurakami$ curl http://localhost:9200
{
  "name" : "tnvsi2-",
  "cluster_name" : "elasticsearch_hitoshimurakami",
  "cluster_uuid" : "CkNLBgkgTvK3gioWuPTKWg",
  "version" : {
    "number" : "6.2.4",
    "build_hash" : "ccec39f",
    "build_date" : "2018-04-12T20:37:28.497551Z",
    "build_snapshot" : false,
    "lucene_version" : "7.2.1",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"

###参考URL
https://qiita.com/y-temp4/items/ffafe1c0ea8a29ce8707
https://qiita.com/nbkn/items/01a11392921119fa0153