SOLR has linear log operations that could trivially be linear

The SOLR code has a few linear log operations that could be linear.  That is, operations of

```

for(key in hashmap) doThing(hashmap.get(key));

```

vs just `for(value in hashmap) doThing(value)`

I have a PR incoming on GitHub to fix a couple of these issue as found by Infer on Muse.