Crafter search can index attached files. For example, I can search the contents of an attached PDF...
However, is it compatible with Docx? and image metadata? (for example jpg) Is there a compatibility list somewhere?
I'm having issues getting docx and a jpg indexed, although a PDF is working perfectly
Crafter Search relies on Solr that uses the Apache Tika library to index binary documents. You can find the list of compatible formats here: https://tika.apache.org/1.16/formats.html (for CrafterCMS 3.0) and https://tika.apache.org/1.5/formats.html (for CrafterCMS 2.x)
For proprietary formats such as docx you need to check the compatibility and the supported fields in the library documentation.