fess search engine

(from github.com/logeshwaris)
I integrated fess 12.3 with external elasticsearch 6.4 for my custom search application. I tried crawling the html page and index the content in elasticsearch. I see that the indexed content,digest is empty in elasticsearch. Only few fields like title,anchor,content_length are getting indexed.

fess_config.properties has crawler.document.html.content.xpath=//BODY by default but still its not indexing.
How can this be done? How do i tell fess /elasticsearch to index the html content so that fess search engine can search the appropriate content from indexed data?

(from github.com/marevol)
I think that your installation was failed or the site does not contain a content.
You can check it by curl command:

curl http://...