No living connections Error while Elasticsearch connections in nodejs - node.js

Question

I am having this problem while connecting the elasticsearch connections.
var elasticsearch = require('elasticsearch');
var client = new elasticsearch.Client({ host: 'localhost:9200',
log: 'trace'});
Elasticsearch ERROR: 2016-07-19T19:09:26Z
Error: Request error, retrying -- connect ECONNREFUSED 127.0.0.1:9200
at Log.error (/root/git_build/FirstMoveChess/node_modules/elasticsearch/src/lib/log.js:225:56)
at checkRespForFailure (/root/git_build/FirstMoveChess/node_modules/elasticsearch/src/lib/transport.js:195:18)
at HttpConnector. (/root/git_build/FirstMoveChess/node_modules/elasticsearch/src/lib/connectors/http.js:154:7)
at ClientRequest.bound (/root/git_build/FirstMoveChess/node_modules/lodash-node/modern/internals/baseBind.js:56:17)
at emitOne (events.js:96:13)
at ClientRequest.emit (events.js:188:7)
at Socket.socketErrorListener (_http_client.js:308:9)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at emitErrorNT (net.js:1272:8)
at _combinedTickCallback (internal/process/next_tick.js:74:11)
at process._tickCallback (internal/process/next_tick.js:98:9)
Elasticsearch TRACE: 2016-07-19T19:09:27Z
-> HEAD http://localhost:9200/

Answer 1

I understand this question is quite old but I wanted to share how you can solve this problem.
If you are locally using elasticsearch
First thing you must do is running elasticsearch on your machine.
Error: Request error, retrying -- connect ECONNREFUSED 127.0.0.1:9200
Because above message indicates that you're not running elasticsearch locally.
So, visit the link and follow the insturction.
Docker environment
It gets much trickier here.
First, follow the instruction here.
And in case you're using node.js elasticsearch client, you have to specify elasticsearch host as 172.24.0.1.
If you use container_name or private IP of container in docker-compose.yml, it won't work.

Answer 2

In case of Docker Container Environment after changing from http://localhost:9200 to http://ipaddress:9200 in docker-compose.yml
please change the following live in docker-compose.yml that is related to CORS
Change this
** http.cors.allow-origin=/https?://localhost(:[0-9]+)?/ **
into this
*- http.cors.allow-origin= **