You can highlight search terms in the search results returned by Apache Solr by using the highlighting feature. Here’s a brief overview of how to use the highlighting feature in Solr:
1. The “hl” parameter: To enable highlighting in Solr, you need to use the “hl” parameter in your search query. For example, to search for documents that contain the word “Solr” and highlight the occurrences of “Solr” in the search results, you would use the following URL:
http://localhost:8983/solr/yourcore/select?q=Solr&hl=true
2. Highlighting parameters: Solr provides a number of parameters that you can use to customize the highlighting feature, such as the fields to highlight, the maximum number of characters to highlight, and the HTML tags to use for highlighting. For example, to highlight occurrences of “Solr” in the “title” field and use the HTML tags “” and “” for highlighting, you would use the following URL:
http://localhost:8983/solr/yourcore/select?q=Solr&hl=true&hl.fl=title&hl.simple.pre=&hl.simple.post=
3. Highlighting response: When highlighting is enabled in Solr, the search results will include an additional section for each document that contains the highlighted snippets of text. The highlighted snippets will be surrounded by the HTML tags specified in the “hl.simple.pre” and “hl.simple.post” parameters.
By using the highlighting feature in Solr, you can easily identify the occurrences of the search terms in the search results, making it easier for users to find the information they are looking for. The Solr documentation provides detailed information on how to use the highlighting feature and other query parameters to fine-tune your search queries.