changed query parsing between 4.10.4 and 5.5.3?

[Bernd Fehling]

Hi list,

while going from SOLR 4.10.4 to 5.5.3 I noticed a change in query parsing.
4.10.4
<str name="rawquerystring">text:star text:trek</str>
  <str name="querystring">text:star text:trek</str>
  <str name="parsedquery">(+((text:star text:trek)~2))/no_coord</str>
  <str name="parsedquery_toString">+((text:star text:trek)~2)</str>

5.5.3
<str name="rawquerystring">text:star text:trek</str>
  <str name="querystring">text:star text:trek</str>
  <str name="parsedquery">(+(+text:star +text:trek))/no_coord</str>
  <str name="parsedquery_toString">+(+text:star +text:trek)</str>

There are very many new features and changes between this two versions.
It looks like a change in query parsing.
Can someone point me to the solr or lucene jira about the changes?
Or even give a hint how to get my "old" query parsing back?

Regards
Bernd