Question
I have a Q&A website, and facing an issue google search engine indexing, please have a look at following use case:
1. User Posted a question: Question gets submitted to Google for indexing through xml sitemap
2. Suppose next day somebody answered that question
Now what happening if my question gets indexed before answering the google is not updating its cache as soon as some change happen in the content, please let me know how can I tell google to recrawl content of my page as soon as somebody add new answer to it?
Answer
You can Re-Submit sitemap through Webmaster or use Fetch as Google Bot option in GWT.