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elasticsearch.js » Host
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Hostedit

The host class is used to represent a single node/host/endpoint. These objects are created automatically by the Client constructor, as well as during sniff operations.

Constructor(params)edit

Paramsedit

Params can either be URL string, or an object with the following properties

host

String — The name of the host

Default
"localhost"

port

Number — The port number to use for this host. Note the default of 9200 is only true if the params are passed as an object. If a string, then default port is evaluated based on the protocol (80 for http, 443 for https).

Default
9200

protocol

String — The name of the protocol this host is reachable on

Default
"http"
Options
  • "http"
  • "https"

path

String — A path prefix that should be prepended to every path requested.

auth

String — Basic authentication i.e. user:password to compute an Authorization header.

query

String,Object — A default set of query string parameters to use on every request.

headers

Object — An object describing the headers to send for every request to this node.

...

Any — When the host receives a configuration object, it assigns all of the object’s keys to itself. This allows you to pass in arbitrary keys and values that can be used within selectors, or other custom functionality.

ssl

Object — Host specific version of the ssl config.

Examplesedit

Using your application to proxy/filter elasticsearch requests can sometimes be a good idea. Use this configuration to always send requests to https://my-site.com/elasticsearch/{{request url}} rather than directly to elasticsearch.  

var client = new elasticsearch.Client({
  host: {
    protocol: 'https',
    host: 'my-site.com',
    port: 80,
    path: '/elasticsearch/'
  }
})

Use custom keys/vals to add special properties to the hosts, that are used by the selector.  

var client = new elasticsearch.Client({
  hosts: [
    {
      protocol: 'https',
      host: 'box1.server.org',
      port: 56394,
      // these custom values are used below by the selector
      country: 'EU',
      weight: 10
    },
    {
      protocol: 'https',
      host: 'box2.server.org',
      port: 56394,
      // these custom values are used below by the selector
      country: 'US',
      weight: 50
    }
  ],
  selector: function (hosts) {
    var myCountry = process.env.COUNTRY;
    // first try to find a node that is in the same country
    var selection = _.find(nodes, function (node) {
      return node.host.country === myCountry;
    });

    if (!selection) {
      // choose the node with the lightest weight.
      selection = _(nodes).sortBy(function (node) {
        return node.host.weight;
      }).first();
    }

    return selection;
  }
});

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