elastic-builder

A JavaScript implementation of the elasticsearch Query DSL

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elastic-builder
!npm versionversion-badgepackage !Build Statusbuild-badgebuild !Coverage Statuscoverage-badgecoverage !semantic-releasesemantic-release-badgesemantic-release
A Node.js implementation of the Elasticsearchelasticsearch DSL for use with the official elasticsearch javascript clientes-js-client with builder syntax.
elastic-builder
Check out the API reference documentationapi-docs.
Relevant blog post: https://blog.logrocket.com/elasticsearch-query-body-builder-node-js/
elastic-builder includes TypeScript definition for superior development experience.

Elasticsearch compatibility

elastic-builder was built for 5.x query DSL. However, the library should be usable with 2.x as well. For older versions of the DSL, you can try elastic.jselastic-js-fork or bodybuilderbodybuilder
elastic-builder is also compatible with elasticsearch 6.0(alpha) for the most part. However, there are some breaking changeses-6-breaking-changes which have been called out in the docs(ex: Script.fileapi-docs-script-file.
What's Included:

Install

npm install elastic-builder --save

Usage

const esb = require('elastic-builder'); // the builder

const requestBody = esb.requestBodySearch()
  .query(esb.matchQuery('message', 'this is a test'));

// OR

const requestBody = new esb.RequestBodySearch().query(
  new esb.MatchQuery('message', 'this is a test')
);

requestBody.toJSON(); // or print to console - esb.prettyPrint(requestBody)
{
  "query": {
    "match": {
      "message": "this is a test"
    }
  }
}

For each class, MyClass, a utility function myClass has been provided which constructs the object for us without the need for new keyword.

REPL

Try it out on the command line using the node REPL:
# Start the repl
node ./node_modules/elastic-builder/repl.js
# The builder is available in the context variable esb
elastic-builder > esb.prettyPrint(
...   esb.requestBodySearch()
...     .query(esb.matchQuery('message', 'this is a test'))
... );
{
  "query": {
    "match": {
      "message": "this is a test"
    }
  }
}

Motivation

Elasticsearch only provides a low level client for making requests. elastic.jselastic-js was a relatively popular library for building the request search body. However, this project is not being maintained nor is the forkelastic-js-fork. There were several changeses-5-breaking-changes in the 5.0 release which make the older libraries unusable.
This library is a port of elastic.js to es6 with elasticsearch 5.x compatibility.

API Reference

API reference can be accessed here - https://elastic-builder.js.org/docs. The docs include examples ported from the official elasticsearch referencees-reference.
API documentation was generated using documentation.jsdocumentation-js. It is being hosted with help from this awesome project - https://github.com/js-org/dns.js.org

Recipes

The library has a few helper recipes:

const qry = esb.cookMissingQuery('user');

qry.toJSON();
{
  "bool": {
    "must_not": {
      "exists": { "field": "user" }
    }
  }
}

Check out the reference docsapi-docs-recipes for more examples.
If you have any recipes, please do share or better yet, create a pull requestcreate-pull-request :smile:.

Changelog

releasesreleases

Examples

Usage with official elasticsearch client:
'use strict';

const elasticsearch = require('elasticsearch');
const esb = require('elastic-builder');

const client = new elasticsearch.Client({
  host: 'localhost:9200',
  log: 'trace'
});

const requestBody = esb
  .requestBodySearch()
  .query(esb.matchQuery('body', 'elasticsearch'));

client
  .search({
    index: 'twitter',
    type: 'tweets',
    body: requestBody.toJSON()
  })
  .then(resp => {
    const hits = resp.hits.hits;
  })
  .catch(err => {
    console.trace(err.message);
  });

// Bool query
const requestBody = esb.requestBodySearch().query(
  esb.boolQuery()
    .must(esb.matchQuery('last_name', 'smith'))
    .filter(esb.rangeQuery('age').gt(30))
);
requestBody.toJSON();
{
  "query": {
    "bool": {
      "must": {
        "match": { "last_name": "smith" }
      },
      "filter": {
        "range": { "age": { "gt": 30 } }
      }
    }
  }
}

// Multi Match Query
const requestBody = esb.requestBodySearch().query(
  esb.multiMatchQuery(['title', 'body'], 'Quick brown fox')
    .type('best_fields')
    .tieBreaker(0.3)
    .minimumShouldMatch('30%')
);
requestBody.toJSON();
{
  "multi_match": {
    "query": "Quick brown fox",
    "type": "best_fields",
    "fields": ["title", "body"],
    "tie_breaker": 0.3,
    "minimum_should_match": "30%"
  }
}

// Aggregation
const requestBody = esb.requestBodySearch()
  .size(0)
  .agg(esb.termsAggregation('popular_colors', 'color'));
requestBody.toJSON();
{
  "size": 0,
  "aggs": {
    "popular_colors": {
      "terms": { "field": "color" }
    }
  }
}

// Nested Aggregation
const requestBody = esb.requestBodySearch()
  .size(0)
  .agg(
    esb.termsAggregation('colors', 'color')
      .agg(esb.avgAggregation('avg_price', 'price'))
      .agg(esb.termsAggregation('make', 'make'))
  );
requestBody.toJSON();
{
  "size": 0,
  "aggs": {
    "colors": {
      "terms": { "field": "color" },
      "aggs": {
        "avg_price": {
          "avg": { "field": "price" }
        },
        "make": {
          "terms": { "field": "make" }
        }
      }
    }
  }
}

// If you prefer using the `new` keyword
const agg = new esb.TermsAggregation('countries', 'artist.country')
  .order('rock>playback_stats.avg', 'desc')
  .agg(
    new esb.FilterAggregation('rock', new esb.TermQuery('genre', 'rock')).agg(
      new esb.StatsAggregation('playback_stats', 'play_count')
    )
  );
agg.toJSON();
{
  "countries": {
    "terms": {
      "field": "artist.country",
      "order": { "rock>playback_stats.avg": "desc" }
    },
    "aggs": {
      "rock": {
        "filter": {
          "term": { "genre": "rock" }
        },
        "aggs": {
          "playback_stats": {
            "stats": { "field": "play_count" }
          }
        }
      }
    }
  }
}

// Sort
const requestBody = esb.requestBodySearch()
  .query(esb.boolQuery().filter(esb.termQuery('message', 'test')))
  .sort(esb.sort('timestamp', 'desc'))
  .sorts([
    esb.sort('channel', 'desc'),
    esb.sort('categories', 'desc'),
    // The order defaults to desc when sorting on the _score,
    // and defaults to asc when sorting on anything else.
    esb.sort('content'),
    esb.sort('price').order('desc').mode('avg')
  ]);
requestBody.toJSON();
{
  "query": {
    "bool": {
      "filter": {
        "term": { "message": "test" }
      }
    }
  },
  "sort": [
    { "timestamp": { "order": "desc" } },
    { "channel": { "order": "desc" } },
    { "categories": { "order": "desc" } },
    "content",
    { "price": { "order": "desc", "mode": "avg" } }
  ]
}

// From / size
const requestBody = esb.requestBodySearch()
  .query(esb.matchAllQuery())
  .size(5)
  .from(10);
requestBody.toJSON();
{
  "query": { "match_all": {} },
  "size": 5,
  "from": 10
}

For more examples, check out the reference docsapi-docs.

Validation

elastic-builder provides lightweight validation where ever possible:
$ node ./node_modules/elastic-builder/repl.js
elastic-builder > esb.multiMatchQuery().field('title').field('body').query('Quick brown fox').type('bwst_fields')
See https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-multi-match-query.html
Got 'type' - bwst_fields
Error: The 'type' parameter should belong to Set {
  'best_fields',
  'most_fields',
  'cross_fields',
  'phrase',
  'phrase_prefix' }
    at MultiMatchQuery.type (E:\Projects\repos\elastic-builder\lib\queries\full-text-queries\multi-match-query.js:134:23)
    at repl:1:77
    at ContextifyScript.Script.runInContext (vm.js:35:29)
    at REPLServer.defaultEval (repl.js:342:29)
    at bound (domain.js:280:14)
    at REPLServer.runBound [as eval] (domain.js:293:12)
    at REPLServer.<anonymous> (repl.js:538:10)
    at emitOne (events.js:96:13)
    at REPLServer.emit (events.js:188:7)
    at REPLServer.Interface._onLine (readline.js:239:10)

Tests

Run unit tests:
npm test

Credits

elastic-builder is heavily inspired by elastic.jselastic-js and the forkelastic-js-fork by Erwan Pigneul.
bodybuilderbodybuilder for documentation style, build setup, demo page.

License

MIT © Suhas Karanthsudo-suhas