magento2 – How to check referenceContainer name

I installed elastic search, Now I need to create layout / default.xml with this code:

<body>
    <referenceContainer name="mytheme_header">
        <block class="SmileElasticsuiteCoreBlockSearchFormAutocomplete" name="top.search" as="topSearch" template="Smile_ElasticsuiteCore::search/form.mini.phtml">
            <arguments>
                <argument name="rendererList" xsi:type="array">
                    <item name="term" xsi:type="array">
                        <item name="title" xsi:type="string" translate="true">Search terms</item>
                        <item name="template" xsi:type="string">Smile_ElasticsuiteCore/autocomplete/term</item>
                    </item>
                </argument>
            </arguments>
        </block>
    </referenceContainer>
    <referenceBlock name="top.search">
        <arguments>
            <argument name="rendererList" xsi:type="array">
                <item name="product" xsi:type="array">
                    <item name="title" xsi:type="string" translate="true">Products</item>
                    <item name="template" xsi:type="string">Smile_ElasticsuiteCatalog/autocomplete/product</item>
                </item>
                <item name="category" xsi:type="array">
                    <item name="title" xsi:type="string" translate="true">Categories</item>
                    <item name="template" xsi:type="string">Smile_ElasticsuiteCatalog/autocomplete/category</item>
                </item>
                <item name="product_attribute" xsi:type="array">
                    <item name="title" xsi:type="string" translate="true">Attributes</item>
                    <item name="template" xsi:type="string">Smile_ElasticsuiteCore/autocomplete/term</item>
                    <item name="titleRenderer" xsi:type="string">Smile_ElasticsuiteCatalog/js/autocomplete/product-attribute</item>
                </item>
            </argument>
        </arguments>
    </referenceBlock>        
</body>

I use Sm Market template. I need call correct: <referenceContainer name="mytheme_header">

What block should I enter here. Some solution?