Yes, you can specify which text you want the indexer to look at when creating description on the Collections > Settings Admin page. You can use any one of the following tags for description:
The meta description tag is a snippet of HTML code that belongs inside the <Head> </Head> section of a web page. It is usually placed after the title tag and before the meta keywords tag, although the order is not important.
The syntax for this HTML tag is:
<META NAME="Description" CONTENT="Your descriptive sentence or two goes here.">