my website ranking top one on Google for years,
but my website home page is de-indexed by Google several days ago.
all the search results from google disppear.
I believe my website has been under some attack and the de-indexed is the hacking results.
I need to find someone to find out the causes of de-index by using google
webmaster tool and website server log,
and get my home page re-index by Google.
give me advice about how to prevent this happen again.