Is there a portlet or anything for searching the content of an article or a news inside the portal
I guess the portlet you are asking is actually a part of ECMS product which is not built-in features in GateIn community version.
Today there are some ECMS which are already integrated/tested with GateIn like eXo Platform. You could have more detail on http://exoplatform.com/company/en/products/features
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