I'm trying to search through my org content by a date range and the query doesn't appear to work.
No errors, but no returned results either.
gis = GIS(portal, username, password)
cm = ContentManager(gis)
#modified: [2018-01-01 TO 2018-05-09]
cmItems = cm.search(query = 'modified: [1514728800000 TO 1525788000000]', max_items = 1000)