### Install Yii2 Elasticsearch Extension via Composer

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/installation.md

Use Composer to install the yiisoft/yii2-elasticsearch package. This is the preferred method for installation.

```bash
composer require --prefer-dist yiisoft/yii2-elasticsearch
```

--------------------------------

### Install Yii 2 Elasticsearch Extension

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/README.md

Install the Yii 2 Elasticsearch extension using composer. Specify the desired version for compatibility.

```bash
composer require --prefer-dist yiisoft/yii2-elasticsearch:"~2.1.0"
```

--------------------------------

### Fetch and Sort by Runtime Field

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-query.md

Example for fetching users' full names by concatenating first and last names, and sorting them alphabetically. Ensure the runtime field is included in the `fields()` array.

```php
$results = (new yii\elasticsearch\Query())
    ->from('users')
    ->runtimeMappings([
        'full_name' => [
            'type' => 'keyword',
            'script' => "emit(doc['first_name'].value + ' ' + doc['last_name'].value)",
        ],
    ])
    ->fields(['full_name'])
    ->orderBy(['full_name' => SORT_ASC])
    ->search($connection);
```

--------------------------------

### Elasticsearch Aggregation Result Example

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

This is an example of the processed data structure returned after performing a date histogram aggregation, mapping date strings to document counts.

```php
[
    '2020-01-01' => 5,
    '2020-02-01' => 3,
    '2020-03-01' => 17,
]
```

--------------------------------

### Find Elasticsearch Records using Query DSL (Match Query)

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Utilize the query() method with Elasticsearch's Query DSL to perform more complex searches. This example uses a 'match' query on the 'title' field.

```php
// Finding records using query DSL
// (see https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-match-query.html)
$articles = Article::find()->query(['match' => ['title' => 'yii']])->all();
```

--------------------------------

### Find Elasticsearch Records using Query DSL (Bool Query)

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

This example demonstrates a more complex query using Elasticsearch's 'bool' query structure, combining 'must' clauses with 'term' and 'terms' filters.

```php
$articles = Article::find()->query([
    'bool' => [
        'must' => [
            ['term' => ['is_active' => true]],
            ['terms' => ['email' => ['johnsmith@example.com', 'janedoe@example.com']]]
        ]
    ]
])->all();
```

--------------------------------

### Retrieve Elasticsearch Records by Primary Key

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Fetch single or multiple records using their primary keys. Methods like get(), findOne(), mget(), and findAll() are available.

```php
// Getting records using the primary key
$customer = Customer::get(1); // get a record by pk
$customer = Customer::findOne(1); // also works
$customers = Customer::mget([1,2,3]); // get multiple records by pk
$customers = Customer::findAll([1, 2, 3]); // also works
```

--------------------------------

### Demonstrating Object Attribute Merging

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

This example shows how Elasticsearch merges object attributes by default when using the `_update` endpoint. Each subsequent save operation merges new data into the existing object attribute.

```php
$customer = new Customer();
$customer->my_attribute = ['foo' => 'v1', 'bar' => 'v2'];
$customer->save();
// at this point the value of my_attribute in Elasticsearch is {"foo": "v1", "bar": "v2"}

$customer->my_attribute = ['foo' => 'v3', 'bar' => 'v4'];
$customer->save();
// now the value of my_attribute in Elasticsearch is {"foo": "v3", "bar": "v4"}

$customer->my_attribute = ['baz' => 'v5'];
$customer->save();
// now the value of my_attribute in Elasticsearch is {"foo": "v3", "bar": "v4", "baz": "v5"}
// but $customer->my_attribute is still equal to ['baz' => 'v5']
```

--------------------------------

### Create a New Elasticsearch Record

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Instantiate a new record, set its primary key (only for new records), and populate attributes before saving. Attributes can be set individually or as an array.

```php
// Creating a new record
$customer = new Customer();
$customer->_id = 1; // setting primary keys is only allowed for new records
$customer->last_name = 'Doe'; // attributes can be set one by one
$customer->attributes = ['first_name' => 'Jane', 'email' => 'janedoe@example.com']; // or together
$customer->save();
```

--------------------------------

### Using ActiveDataProvider with Elasticsearch Query

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-data-providers.md

Demonstrates how to configure and use the yii\elasticsearch\ActiveDataProvider with a yii\elasticsearch\Query, including setting pagination, retrieving models, aggregations, and suggestions.

```php
use yii\elasticsearch\ActiveDataProvider;
use yii\elasticsearch\Query;

// Using Query
$query = new Query();
$query->from('customer');

// ActiveQuery can also be used
// $query = Customer::find();

$query->addAggregate(['date_histogram' => [
    'field' => 'registered_at',
    'calendar_interval' => 'month',
]]);

$query->addSuggester('customer_name', [
    'text' => 'Hans',
    'term' => [
        'field' => 'customer_name',
    ]
]);

$dataProvider = new ActiveDataProvider([
    'query' => $query,
    'pagination' => [
        'pageSize' => 10,
    ]
]);

$models = $dataProvider->getModels();
$aggregations = $dataProvider->getAggregations();
$suggestion = $dataProvider->getSuggestions();
```

--------------------------------

### Enable Elasticsearch DebugPanel

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/topics-debug.md

Add this configuration to your application's config file to enable the Elasticsearch DebugPanel within the yii debug module. Ensure the debug module is already bootstrapped and configured.

```php
    // ...
    'bootstrap' => ['debug'],
    'modules' => [
        'debug' => [
            'class' => 'yii\debug\Module',
            'panels' => [
                'elasticsearch' => [
                    'class' => 'yii\elasticsearch\DebugPanel',
                ],
            ],
        ],
    ],
    // ...
```

--------------------------------

### Find Elasticsearch Records with Simple Conditions

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Use the find() and where() methods to retrieve records based on simple attribute-value conditions. The one() method fetches the first matching record.

```php
// Finding records using simple conditions
$customer = Customer::find()->where(['first_name' => 'John', 'last_name' => 'Smith'])->one();
```

--------------------------------

### Define Query Building Blocks in Yii2 Elasticsearch

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Create static methods within a custom query class to encapsulate reusable query components, making complex queries more manageable.

```php
class CustomerQuery extends ActiveQuery
{
    public static function name($name)
    {
        return ['match' => ['name' => $name]];
    }

    public static function address($address)
    {
        return ['match' => ['address' => $address]];
    }

    public static function registrationDateRange($dateFrom, $dateTo)
    {
        return ['range' => ['registered_at' => [
            'gte' => $dateFrom,
            'lte' => $dateTo,
        ]]];
    }
}
```

--------------------------------

### Define Customer Relations (Orders and Invoices)

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Defines a `hasMany` relation for orders and a `via` relation for invoices from a Customer Elasticsearch ActiveRecord. Ensure limits are explicitly set for both relations, especially for via-relations, to match expected data retrieval.

```php
class Customer extends yii\elasticsearch\ActiveRecord
{
    // Every customer has multiple orders, every order has exactly one invoice

    public function getOrders()
    {
        // This relation gets up to 100 most recent orders of current customer
        return $this->hasMany(Order::className(), ['customer_id' => '_id'])
                    ->orderBy(['created_at' => SORT_DESC])
                    ->limit(100); // override the default limit of 10
    }

    public function getInvoices()
    {
        // This via-relation works by fetching the related "orders"
        // models first. This query also needs a limit, but it makes
        // no sense to make that limit different from the underlying
        // relation.
        return $this->hasMany(Invoice::className(), ['_id' => 'order_id'])
                    ->via('orders')->limit(100);
    }
}
```

--------------------------------

### Add Term Suggester to Elasticsearch Query

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Utilize `addSuggester` to implement a term suggester for finding similar search terms within a specified field. Using `limit(0)` ensures only suggestions are returned, not search hits.

```php
$searchResult = Customer::find()->limit(0)
->addSuggester('customer_name', [
    'text' => 'Hans',
    'term' => [
        'field' => 'name',
    ]
])->search();

// Note that limit(0) will prevent the query from returning hits,
// so only suggestions are returned

$suggestions = ArrayHelper::map($searchResult["suggest"]["customer_name"], 'text', 'options');
$names = ArrayHelper::getColumn($suggestions['Hans'], 'text');
// $names == ['Hanns', 'Hannes', 'Hanse', 'Hansi']
```

--------------------------------

### Configure Yii2 Elasticsearch Connection Component

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/installation.md

Configure the Elasticsearch connection component in your Yii application's configuration file. Ensure the 'nodes' are correctly set for your Elasticsearch cluster.

```php
return [
    //....
    'components' => [
        'elasticsearch' => [
            'class' => 'yii\elasticsearch\Connection',
            'nodes' => [
                ['http_address' => '127.0.0.1:9200'],
                // configure more hosts if you have a cluster
            ],
            // set autodetectCluster to false if you don't want to auto detect nodes
            // 'autodetectCluster' => false,
            'dslVersion' => 7, // default is 5
        ],
    ],
];
```

--------------------------------

### Construct Complex Elasticsearch Queries in Yii2

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Combine query building blocks defined in a custom query class to construct and execute complex boolean queries against Elasticsearch using Yii2's Active Record.

```php
$customers = Customer::find()->query([
    'bool' => [
        'must' => [
            CustomerQuery::registrationDateRange('2016-01-01', '2016-01-20')
        ],
        'should' => [
            CustomerQuery::name('John'),
            CustomerQuery::address('London'),
        ],
        'must_not' => [
            CustomerQuery::name('Jack'),
        ],
    ],
])->all();
```

--------------------------------

### Define Elasticsearch ActiveRecord Class

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Extend yii\elasticsearch\ActiveRecord and implement the attributes() method to define record attributes. Do not include the primary key attribute (_id) in the attributes list.

```php
class Customer extends yii\elasticsearch\ActiveRecord
{
    // Other class attributes and methods go here
    // ...
    public function attributes()
    {
        return ['first_name', 'last_name', 'order_ids', 'email', 'registered_at', 'updated_at', 'status', 'is_active'];
    }
}
```

--------------------------------

### Set track_total_hits to 'true' in Query

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-query.md

Use this option to ensure exact document counts are always returned, overriding the default threshold of 10,000 hits. Note that the value must be a literal string 'true', not a boolean.

```php
$query = new Query();
$query->from('customer');

// Note the literal string 'true', not a boolean value!
$query->addOptions(['track_total_hits' => 'true']);
```

--------------------------------

### Add Date Histogram Aggregation to Elasticsearch Query

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Use `addAggregate` to define a date histogram aggregation for grouping documents by month based on a date field. Set `limit(0)` to retrieve only metadata and aggregations, not search hits.

```php
$searchResult = Customer::find()->addAggregate('customers_by_date', [
    'date_histogram' => [
        'field' => 'registered_at',
        'calendar_interval' => 'month',
    ],
])->limit(0)->search();

$customersByDate = ArrayHelper::map($searchResult['aggregations']['customers_by_date']['buckets'], 'key_as_string', 'doc_count');
```

--------------------------------

### Define Elasticsearch Mapping in Yii2 ActiveRecord

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/mapping-indexing.md

Defines the mapping for an Elasticsearch index within a Yii2 ActiveRecord model. This includes field types and properties.

```php
class Customer extends yii\elasticsearch\ActiveRecord
{
    // Other class attributes and methods go here
    // ...

    /**
     * @return array This model's mapping
     */
    public static function mapping()
    {
        return [
            // Field types: https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping.html#field-datatypes
            'properties' => [
                'first_name'     => ['type' => 'text'],
                'last_name'      => ['type' => 'text'],
                'order_ids'      => ['type' => 'keyword'],
                'email'          => ['type' => 'keyword'],
                'registered_at'  => ['type' => 'date'],
                'updated_at'     => ['type' => 'date'],
                'status'         => ['type' => 'keyword'],
                'is_active'      => ['type' => 'boolean'],
            ]
        ];
    }

    /**
     * Set (update) mappings for this model
     */
    public static function updateMapping()
    {
        $db = static::getDb();
        $command = $db->createCommand();
        $command->setMapping(static::index(), static::type(), static::mapping());
    }

    /**
     * Create this model's index
     */
    public static function createIndex()
    {
        $db = static::getDb();
        $command = $db->createCommand();
        $command->createIndex(static::index(), [
            //'aliases' => [ /* ... */ ],
            'mappings' => static::mapping(),
            //'settings' => [ /* ... */ ],
        ]);
    }

    /**
     * Delete this model's index
     */
    public static function deleteIndex()
    {
        $db = static::getDb();
        $command = $db->createCommand();
        $command->deleteIndex(static::index(), static::type());
    }
}
```

--------------------------------

### Configure Array Attributes in Yii2 Elasticsearch

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

Override the default behavior of treating single-item arrays as values by defining `arrayAttributes()` to ensure fields like 'order_ids' are always returned as arrays.

```php
public function arrayAttributes()
{
    return ['order_ids'];
}
```

--------------------------------

### Overwriting Object Attributes

Source: https://github.com/yiisoft/yii2-elasticsearch/blob/master/docs/guide/usage-ar.md

To prevent Elasticsearch from merging object attributes and instead overwrite them, wrap the object attribute value in a single-element array. This ensures the entire object is replaced with the new value.

```php
$customer->my_attribute = [['new' => 'value']]; // note the double brackets
$customer->save();
// now the value of my_attribute in Elasticsearch is {"new": "value"}
$customer->my_attribute = $customer->my_attribute[0]; // could be done for consistency
```

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