Use the first section of any level (not just level 2)

Fixes #8011
quarto-dev · Dec 22, 2023 · ef09563 · ef09563
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diff --git a/news/changelog-1.4.md b/news/changelog-1.4.md
@@ -198,6 +198,7 @@
 - ([#5630](https://github.com/quarto-dev/quarto-cli/issues/5630)): Properly form sharing URL for books
 - ([#6708](https://github.com/quarto-dev/quarto-cli/issues/6708)): Prevent duplication of footnotes within the abstract or description within websites and books.
 - ([#7206](https://github.com/quarto-dev/quarto-cli/issues/7206)): Properly enabled `issue-url` for books
+- ([#8011](https://github.com/quarto-dev/quarto-cli/issues/8011)): Improve support for unsectioned chapters in search.
 
 ## Publishing
 

diff --git a/src/project/types/website/website-search.ts b/src/project/types/website/website-search.ts
@@ -299,7 +299,7 @@ export async function updateSearchIndex(
         );
         if (sections.length > 0) {
           const mainSelector = projectIsBook(context)
-            ? "section.level1"
+            ? "main > section:first-of-type"
             : "main.content";
 
           const mainEl = doc.querySelector(mainSelector);