iOS9 enables apps to participate in the Spotlight search feature. You will be able to swipe down as before and have search 'look inside' iThoughts. The following screenshot shows how a simple search for 'ithought' will surface all the maps I've recently viewed.
I can also search on something more specific - in the following case a search for 'covey' will surface 2 maps that I have which summarise some of Stephen Covey's work.
...and who knew that a covey is a social grouping of certain animals :-)