config.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
    <default>
        <catalog>
            <seo>
                <search_terms>1</search_terms>
            </seo>
            <search>
                <engine>mysql</engine>
                <min_query_length>1</min_query_length>
                <max_query_length>128</max_query_length>
                <max_count_cacheable_search_terms>100</max_count_cacheable_search_terms>
                <autocomplete_limit>8</autocomplete_limit>
                <enable_eav_indexer>1</enable_eav_indexer>
            </search>
        </catalog>
    </default>
</config>