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The highlightPreTag parameter defines the HTML tag inserted before the matching text in highlighted attributes. It works in combination with highlightPostTag, which marks the end of the highlighted portion.

​
Usage

  • Set an empty string ("") to fallback to the default tag.
  • To turn off highlighting, remove the searchable attribute with the attributesToHighlight parameter.

​
Examples

​
Set default tag

Current API clients

var response = await client.SetSettingsAsync(
  "INDEX_NAME",
  new IndexSettings { HighlightPreTag = "<em>" }
);

IndexSettings settings = new IndexSettings()
settings.HighlightPreTag = "";

index.SetSettings(settings);

Current API clients

var response = await client.SearchSingleIndexAsync<Hit>(
  "INDEX_NAME",
  new SearchParams(new SearchParamsObject { Query = "query", HighlightPreTag = "<strong>" })
);

index.Search(new Query("query")
{
    HighlightPreTag = ""
});
Last modified on March 23, 2026