README

Elasticsearch implementation for Silverstripe.

Disclaimer

If this module breaks your website, you get to keep all the pieces.

Acknowledgements

Pikselin Ltd., Part of this module has been created thanks to support from Pikselin
Marco Sheepy Hermo, the amount of pre-work from the Solr module, done by Marco, has made this work a lot easier

Installation

composer require firesphere/elastic

Requirements

PHP8+
Elasticsearch 8.10+
Silverstripe Framework 4 || 5

Elastic search with Silverstripe

This module provides an API similar to the Solr Search module.

Basic search index

Create an API-index in your ElasticSearch instance
- If you have Elastic Enterprise, this is under Search => API
Create an API key
- You can use a username/password, but API key is recommended

Configuring the service

Configuration is done in YML:

---
Name: MyElastic
---
Firesphere\ElasticSearch\Services\ElasticCoreService:
  config:
    endpoint:
      - host: "https://my-elasticinstance.elastic-cloud.com"
        apiKey: "mybase64apikeyhere==="
        username: "Elastic"
        password: "mysupersecretpassword"
        port: 443

Take special note of the port. When using your own Elastic instance, this might be the standard port 9200. On Elastic Cloud, it's all routed through a reverse proxy on port 443 (https).

NOTE It's obviously never a great idea to use api keys or passwords in YML, but that's okay, to configure it from environment:

ELASTIC_ENDPOINT=host.example.com
ELASTIC_USERNAME=user@example.com
ELASTIC_PASSWORD=examplepassword
ELASTIC_API_KEY=mybase64apikeyhere===
ELASTIC_PORT=443
ELASTIC_PROTOCOL=https

And in your YML:

---
Name: MyElastic
---
Firesphere\ElasticSearch\Services\ElasticCoreService:
  config:
    endpoint: ENVIRONMENT

Creating an index

An index has two parts, the class and the configuration.

The most basic class would by something like the following:

<?php


namespace Firesphere\MyProject\Indexes;

use Firesphere\ElasticSearch\Indexes\ElasticIndex;

class ElasticProjectIndex extends ElasticIndex
{
    public function getIndexName()
    {
        return 'search-indexname';
    }
}

Where search-indexname is the name of the index you've chosen when configuring it in Elastic.

The accompanying YML that configures the fields would potentially look like this:

Firesphere\ElasticSearch\Indexes\ElasticIndex:
  search-indexname:
    Classes:
      - Page
    FulltextFields:
      - Title
      - Content
      - Description
      - getElementsForSearch
      - Impression.Title
    FilterFields:
      - OwnerID
    FacetFields:
      Firesphere\MyProject\Models\Tag:
        BaseClass: Page
        Field: Tags.ID
        Title: Tag

This would at index time add those related fields in to the index, as well as at search runtime ensure all the fields are properly added as filters, where needed.

Further configuration

Please refer to the Solr documentation, and take the YML there as a guideline for configuring Elastic.

The goal is to have a near-identical API, which is largely the case already.

Creating a search

In a controller of choice, here is an example of a search:

class MyController extends PageController
{
    public function search()
    {   
        $query = $this->getRequest()->getVars();
        if (isset($query['query'])) {
            $baseQuery = new ElasticQuery();
            // Add the term
            $baseQuery->addTerm($query['query']);
            // Ensure to start at 0
            $start = isset($query['start']) ? $query['start'] : 0;
            $baseQuery->setStart($start);
            // Get the index
            $index = new ElasticProjectIndex();
            // And do the search
            $this->Results = $index->doSearch($baseQuery);
        }

        return $this;
    }
}

Permissions

As with the Solr search, all documents are indexed with a ViewStatus field. This field determines who can see the results. At search runtime, the value is calculated based on the current user and as such passed in as an extra, required, filter.

Further functionality

Done(~ish)

[x] Basic filtering
[x] Pagination
[x] Actually, you know... search
[x] Highlighting~ish
[x] Synonyms
[x] Group-access filtering (e.g. all, administrators, specific groups, from access setting in the CMS)
[x] Boosting
[x] Faceting
[x] Spellchecking
[x] Unit tests and integration tests

On the to-do list is:

[ ] Work out the filtering better
[ ] File content searching
[ ] Submodules for
- [ ] Member level permissions
- [ ] Subsites
- [ ] Fluent

License

LGPL v3.0 or later

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firesphere / elastic-search

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