What makes a good autowarming query in Solr and how do they work?

This question is a follow up to this question about infrequent, isolated read timeouts in a solr installation.

As a possible problem missing / bad autowarming queries for new searchers were found.

Now I am confused about how good autowarming queries should "look like".

I read up but couldnt find any good documentation on this.

Should they hit a lot of documents in the index? Or should they have matches in all distinct fields that exist in the index?

Wouldnt just *:* be the best autowarming query or why not?

The example solr config has theese sample queries in it:

solr 0 10
rocks 0 10

I changed them to:

george 0 10

Why? Because the index holds film entities with fields for titles and actors. Those are the most searched ones. And george appears in titles and actors.

I don't really know whether this makes sense. So my question is:

• What would be good autowarming queries for my index and why?
• What makes a good autowarming query?

This is an example document from the index. The index has about 70,000 documents and they all look like this (only different values of course): example document:

  
  Tommy Lee JonesWill SmithRip Torn 
    Lara Flynn BoyleJohnny KnoxvilleRosario DawsonTony Shalhoub 
    Patrick WarburtonJack KehlerDavid CrossColombe Jacobsen-Derstine 
    Peter SpellosMichael RivkinMichael Bailey SmithLenny Venito 
    Howard SpiegelAlpheus MerchantJay JohnstonJoel McKinnon Miller 
    Derek Cecil 
  amazon 
  Men in Black IIMIB 2MIIB 
    Men in Black 2Men in black II (Hombres de negro II)Hombres de negro IIHommes en noir II 
  false 
  US 
  Agent J (Will Smith) muss die Erde wieder vor einigem Abschaum bewahren, denn in Gestalt des verführerischen Dessous-Models Serleena (Lara Flynn Boyle) will ein Alien den Planeten unterjochen. Dabei benötigt J die Hilfe seines alten Partners Agent K (Tommy Lee Jones). Der wurde aber bei seiner "Entlassung" geblitzdingst, und so muß J seine Erinnerung erst mal etwas auffrischen bevor es auf die Jagd gehen kann. 
  Barry Sonnenfeld 
  120912 
  ActionKomödieScience Fiction 
  120912 
  /media/search/filmcovers/105x/kf/false/F6Q1XW.jpg 
  120912 
  2011-03-01T18:51:35.903Z 
  Men in Black II 
  3238 
  0 
  amazon 
  dvd 
  49 
  meninblack 
  1 
  /film/Men-in-Black-II-Barry-Sonnenfeld-Tommy-Lee-Jones-F6Q1XW/ 
  2002 
  

Most queries are exact match queries on actor fields with some filters in place.

Example:

INFO: [] webapp=/solr path=/select/ params={facet=true&sort=score+asc,+malus+asc,+year+desc&hl.simple.pre=starthl&hl=true&version=2.2&fl=*,score&facet.query=year:[1900+TO+1950]&facet.query=year:[1951+TO+1980]&facet.query=year:[1981+TO+1990]&facet.query=year:[1991+TO+2000]&facet.query=year:[2001+TO+2011]&bf=div(sub(10000,malus),100)^10&hl.simple.post=endhl&facet.field=genre&facet.field=country&facet.field=blockbuster&facet.field=affiliate&facet.field=product_type&qs=5&qt=dismax&hl.fragsize=200&mm=2&facet.mincount=1&qf=actor^0.1&f.blockbuster.facet.mincount=0&f.genre.facet.limit=20&hl.fl=actor&wt=json&f.affiliate.facet.mincount=1&f.country.facet.limit=20&rows=10&pf=actor^5&start=0&q="Josi+Kleinpeter"&ps=3} hits=1 status=0 QTime=4