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The opensolr web crawler now indexes and follows any file type in your web root.
To learn more about what fields are indexed, simply create a new opensolr index, go to Config Files Editor, and select schema.xml.
All the fields inside the schema.xml are indexed.
Every time you start the crawler, it will recrawl all urls, and will replace the old content with the new one for each URL.
Therefore, this could be considered as updating your website crawled content.