> text:abstract&hl=true&hl.fl=text&f.text.hl.snippets=2&f.text.hl.fragsize=200&debugQuery=true

Three things to check:

1-) See your text field declared as suitable for highlighting.
http://wiki.apache.org/solr/FieldOptionsByUseCase

2-) Increase hl.maxAnalyzedChars=Integer.MAX 

3-) Increase  <maxFieldLength>Integer.MAX</maxFieldLength>

For some reason (complex analysis etc) snippets cannot be always generated. For 
this cases consider using hl.alternateField and hl.maxAlternateFieldLength

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