A I need to perform a phrase search. On the search results Im getting the exact phrase matches but looking at the highlighted parts I see that the phrase
The parameter that needed to be inserted was hl.q which basically means "I want this phrase to be highlighted" and hl.usePhraseHighlighter=true and hl.useFastVectorHighlighter=true
So by adding to my original query : &hl.q="Day+1"&hl.usePhraseHighlighter=true&hl.useFastVectorHighlighter=true worked.
for B) I changed fq = post:"day 1" OR title:"day 1" to fq = post:"day 1". I know that the latter is less from what I need be neverthless is works.
fastVectorHighliter configuration that was used: