elasticsearch api in angular 2 application - api

Question

I am not sure , how to use elasticsearch API avaialble in below link in angular application.
https://www.elastic.co/guide/en/elasticsearch/reference/current/search.html
I have gone through the below sit for using elasticsearch services.But for other functionality like multi field search, conditional search, pagination with first and last pages, i didnt get any idea how to proceed.
http://javasampleapproach.com/frontend/angular/angular-4-elasticsearch-example-quick-start-how-to-add-elasticsearch-js#comment-3537
Please kindly share any links or guide me using elastic search in angular cli (angular 2) application.

Answer 1

There is a javascript client available too.
https://www.npmjs.com/package/elasticsearch
npm install elasticsearch --save
Its typings are available from definitelyTypes
npm install #types/elasticsearch --save
Then you can directly use in your angular application
Example :
To create ElasticSearch client
...
import { Client } from 'elasticsearch';
...
this.esClient = new Client({
host: 'elastic-url'
});
...
everything is there in the official client For features such as pagination, conditional search you have to constuct your query properly before passing.
Example Query:
{
"query": {
"bool": {
"should": [
{
"term": {
"param2": "HUMAN"
}
},{
"match": {
"param1": "param1"
}
}
]
}
}
Example Usage:
client.search({
index: 'masterindex',
body: {
"size":0,
"query": esQuery,
"aggs": aggOBj
}
},(error, response)=> {})