Does anyone know how to include PDF documents in drupal 7 search?
I can not find anything to achieve this.
The Apache Solr Attachments module does this, but currently has a development version (unstable) for Drupal 7.
Check out the search API and its sibling module Attachments API for Search . It uses Apache Tika to parse text from documents.
:
https://drupal.org/project/search_files
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