phpbb/phpBB/config/default/container/services_search.yml

services:

    search.state_helper:
        class: phpbb\search\state_helper
        arguments:
            - '@config'
            - '@search.backend_factory'

# Search backends
    search.fulltext.mysql:
        class: phpbb\search\backend\fulltext_mysql
        arguments:
            - '@config'
            - '@dbal.conn'
            - '@dispatcher'
            - '@language'
            - '@user'
            - '%tables.search_results%'
            - '%core.root_path%'
            - '%core.php_ext%'
        tags:
            - { name: search.backend }

    search.fulltext.native:
        class: phpbb\search\backend\fulltext_native
        arguments:
            - '@config'
            - '@dbal.conn'
            - '@dispatcher'
            - '@language'
            - '@user'
            - '%tables.search_results%'
            - '%tables.search_wordlist%'
            - '%tables.search_wordmatch%'
            - '%core.root_path%'
            - '%core.php_ext%'
        tags:
            - { name: search.backend }

    search.fulltext.postgres:
        class: phpbb\search\backend\fulltext_postgres
        arguments:
            - '@config'
            - '@dbal.conn'
            - '@dispatcher'
            - '@language'
            - '@user'
            - '%tables.search_results%'
            - '%core.root_path%'
            - '%core.php_ext%'
        tags:
            - { name: search.backend }

    search.fulltext.sphinx:
        class: phpbb\search\backend\fulltext_sphinx
        arguments:
            - '@auth'
            - '@config'
            - '@dbal.conn'
            - '@dbal.tools'
            - '@dispatcher'
            - '@language'
            - '@log'
            - '@user'
            - '%core.root_path%'
            - '%core.php_ext%'
        tags:
            - { name: search.backend }

# Factory
    search.backend_factory:
        class: phpbb\search\search_backend_factory
        arguments:
            - '@config'
            - '@search.backend_collection'

# Collections
    search.backend_collection:
        class: phpbb\di\service_collection
        arguments:
            - '@service_container'
        tags:
            - { name: service_collection, tag: search.backend, class_name_aware: true }