PHP中ElasticSearch高级特性，如同义词扩展、自动建议和聚类分析，如何使用这些功能？（ElasticSearch高级功能的PHP实现）

同义词扩展

同义词扩展功能可以帮助用户在搜索查询中使用同义词或相关词语。Elasticsearch 通过使用同义词词典来实现此功能。

PHP 实现：

$client->indices()->putMapping([
    "index" => "my-index",
    "body" => [
        "settings" => [
            "analysis" => [
                "analyzer" => [
                    "my_analyzer" => [
                        "tokenizer" => "standard",
                        "filter" => ["lowercase", "synonym"]
                    ]
                ]
            ]
        ],
        "mappings" => [
            "properties" => [
                "title" => [
                    "type" => "text",
                    "analyzer" => "my_analyzer"
                ]
            ]
        ]
    ]
]);
$client->index([
    "index" => "my-index",
    "id" => "1",
    "body" => [
        "title" => "Elasticsearch Tutorial"
    ]
]);
$result = $client->search([
    "index" => "my-index",
    "body" => [
        "query" => [
            "match" => [
                "title" => "Elasticsearch Guide"
            ]
        ]
    ]
]);

自动建议

自动建议功能可以在用户输入时提供相关建议。Elasticsearch 使用建议器来实现此功能。

PHP 实现：

$client->indices()->putMapping([
    "index" => "my-index",
    "body" => [
        "settings" => [
            "analysis" => [
                "analyzer" => [
                    "autocomplete" => [
                        "tokenizer" => "autocomplete",
                        "filter" => ["lowercase"]
                    ]
                ]
            ]
        ],
        "mappings" => [
            "properties" => [
                "title" => [
                    "type" => "completion",
                    "analyzer" => "autocomplete"
                ]
            ]
        ]
    ]
]);
$client->index([
    "index" => "my-index",
    "id" => "1",
    "body" => [
        "title" => "Elasticsearch Tutorial"
    ]
]);
$result = $client->suggest([
    "index" => "my-index",
    "body" => [
        "title" => [
            "text" => "Elasticsearch",
            "completion" => [
                "field" => "title"
            ]
        ]
    ]
]);

聚类分析

聚类分析功能可以将文档分组到具有相似特征的集群中。Elasticsearch 使用聚合来实现此功能。

PHP 实现：

$result = $client->search([
    "index" => "my-index",
    "body" => [
        "size" => 0,
        "aggs" => [
            "clusters" => [
                "terms" => [
                    "field" => "category"
                ]
            ]
        ]
    ]
]);

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