These integration guides are not official documentation and the Strapi Support Team will not provide assistance with them.

Introduction to ElasticSearch and Strapi

Elasticsearch and Strapi are two powerful tools that enhance web applications. Elasticsearch is a distributed search and analytics engine designed for scalability and speed. It excels at full-text search, allowing users to perform complex queries quickly. 

When combined, Elasticsearch and Strapi provide robust search capabilities for your application. Strapi handles content creation and management, while Elasticsearch indexes that content, making it searchable in real time. Integrating the two allows for efficient data retrieval and an improved user experience through faster search results.

Why Use Strapi with ElasticSearch

By choosing to use a headless CMS like Strapi with ElasticSearch, you can enhance your application's search capabilities, providing users with effective ways to find and interact with content.

Enhance Search Capabilities

ElasticSearch enables full-text search across all your content. It handles complex queries and offers features like fuzzy matching and relevance ranking, making search results more accurate and useful for your users. If you're looking to improve search functionality in your application, ElasticSearch provides the tools needed. Alternatively, consider implementing advanced search with Algolia for additional search capabilities.

Improve Performance

Offloading search queries to ElasticSearch reduces the load on your Strapi server. ElasticSearch is designed to handle large volumes of data and complex operations quickly, improving your application's overall performance.

Achieve Scalability

As your content grows, ElasticSearch scales to meet increasing demands. It manages more data and higher traffic without slowing down, ensuring that your application's search capabilities remain responsive.

Deliver a Better User Experience

With faster and more accurate search results, users can find the content they need quickly. Enhanced search improves user satisfaction and engagement with your application. This is particularly important when using a headless CMS for mobile apps, as mobile users expect quick and seamless experiences.

Key Features of ElasticSearch

Employ Full-Text Search

ElasticSearch excels at full-text search, delivering fast and accurate results across large datasets. It supports complex queries, including phrase matching and fuzzy searches, allowing users to find relevant information efficiently.

Achieve High Performance and Scalability

Built on top of Apache Lucene, ElasticSearch is designed for speed and can handle large volumes of data. Its distributed architecture enables horizontal scaling, ensuring consistent performance as your data grows.

Use Advanced Query Capabilities

With a rich query language, ElasticSearch allows for complex search expressions. It supports filtering, aggregations, and sorting, enabling you to create sophisticated search functionalities tailored to specific needs. By aligning your content modeling in Strapi with ElasticSearch's capabilities, you can optimize search performance and relevance.

Implement Real-Time Indexing

ElasticSearch offers real-time indexing, making new or updated data immediately searchable. This is crucial for applications that require up-to-date information, enhancing the user experience with the latest content.

Optimize Relevance and Ranking

Advanced algorithms in ElasticSearch provide relevance scoring and result ranking. Search results are ordered to surface the most pertinent information first, improving the overall effectiveness of searches.

Handle Versatile Data

ElasticSearch supports various data types, including text, numbers, dates, and geolocation data. This versatility makes it suitable for a wide range of applications and industries.

Employ Robust Analytics

Beyond search, ElasticSearch includes powerful analytics capabilities. It can perform aggregations to provide insights into data patterns and trends, enabling features like faceted search and data visualizations.

Best Practices of Integrating ElasticSearch With Strapi

Secure Your ElasticSearch Instance

Ensure your ElasticSearch instance is properly secured, especially if it's accessible over the network. Configure authentication and TLS to protect your data. Store sensitive information like ElasticSearch credentials in environment variables.

Keep Indices in Sync with Strapi Content

Maintaining synchronization between your Strapi content and ElasticSearch indices is essential. To implement real-time indexing in Strapi models using lifecycle hooks, ensure that hooks like afterCreate, afterUpdate, and afterDelete are configured to update the Elasticsearch index. Consult Strapi's documentation for detailed guidance.

Implement Robust Error Handling

Incorporate proper error handling in your ElasticSearch operations to prevent your application from crashing and to provide meaningful error messages. Use try-catch blocks or promise error handlers when performing indexing and search operations.

Monitor and Optimize Performance

Monitor the performance of your ElasticSearch queries and optimize them as necessary. Configure the maximum number of search results returned to improve response times and reduce load. Use ElasticSearch's profiling tools to identify and address performance bottlenecks.

Customize Search Logic

Adjust the search logic in your ElasticSearch service to match your application's specific needs. Implement features like fuzzy matching, boosting certain fields, and filtering based on content types.

Define Appropriate Index Mappings

Create appropriate index mappings in ElasticSearch that reflect the structure of your Strapi content types. Define the data types for each field to optimize search capabilities and performance.

1await client.indices.create({
2
3  index: 'articles',
4
5  body: {
6
7    mappings: {
8
9      properties: {
10
11        id: { type: 'integer' },
12
13        title: { type: 'text' },
14
15        content: { type: 'text' },
16
17        // Additional fields...
18
19      },
20
21    },
22
23  },
24
25});

Test Thoroughly

Before deploying your integration to a production environment, thoroughly test all aspects of the ElasticSearch integration. Verify that indexing occurs correctly when content is created or updated, and that search queries return the expected results.

Consider Data Privacy Regulations

Be mindful of data privacy regulations when indexing content. Ensure that sensitive information isn't inadvertently exposed through search results. Implement access controls and consider anonymizing personal data if necessary.

Getting Started With ElasticSearch

First, install and run ElasticSearch on your system, ensuring it's accessible at http://localhost:9200. For a detailed walkthrough, refer to the Elasticsearch setup guide for Strapi.

Install the ElasticSearch Client

In your Strapi project directory, install the ElasticSearch client library:

npm install @elastic/elasticsearch

Configure the Connection

Create a configuration file at config/elasticsearch.js:

1  connection: {
2
3    node: '<http://localhost:9200>', // Specify your ElasticSearch URL if different
4
5  },
6
7};

Alternatively, to use environment variables:

module.exports = ({ env }) => ({

  connection: {

    node: env('ELASTICSEARCH_HOST', 'http://localhost:9200'),

  },

});

Create the ElasticSearch Service

1const config = require('../../../config/elasticsearch');
2
3module.exports = {
4
5  client: null,
6
7  initialize() {
8
9    this.client = new Client(config.connection);
10
11  },
12
13  async search(query) {
14
15    if (!this.client) this.initialize();
16
17    const { body } = await [this.client.search](http://this.client.search)({
18
19      index: 'your_index_name',
20
21      body: {
22
23        query: {
24
25          match: { title: query },
26
27        },
28
29      },
30
31    });
32
33    return body.hits.hits;
34
35  },
36
37  async index(data) {
38
39    if (!this.client) this.initialize();
40
41    await this.client.index({
42
43      index: 'your_index_name',
44
45      body: data,
46
47    });
48
49  },
50
51};

Set Up the Controller

Create a controller at src/api/search/controllers/search.js:

1module.exports = {
2
3  async search(ctx) {
4
5    const data = await strapi.service('api::[search.search](http://search.search)').search(ctx.query.q);
6
7    ctx.body = data;
8
9  },
10
11};

Define the Route

Configure the route in src/api/search/routes/search.js:

1module.exports = {
2
3  routes: \[
4
5    {
6
7      method: 'GET',
8
9      path: '/search',
10
11      handler: '[search.search](http://search.search)',
12
13    },
14
15  \],
16
17};

Index Your Content

To keep ElasticSearch in sync with your content, lifecycle hooks can be added. For instance, in src/api/article/content-types/article/lifecycles.js, you can use:

1module.exports = {
2
3  async afterCreate(event) {
4
5    await strapi.service('api::[search.search](http://search.search)').index(event.result);
6
7  },
8
9  async afterUpdate(event) {
10
11    await strapi.service('api::[search.search](http://search.search)').index(event.result);
12
13  },
14
15};

Perform Searches

With the setup complete, you can perform searches using your new endpoint:

1GET /api/search?q=your_search_term

This integration allows you to use ElasticSearch's robust search features within your Strapi application.