[TYPO3-Solr] plugin.tx_solr.search.query.fields and score

[Manfred Mirsch]

Hi,
i try to boost a search field by modifying this typoscript:
plugin.tx_solr.search.query {
   fields = keywords^100.0, title^5.0, content^1.0
}

How does the parameters after fieldname^ influence the score?
The strange thing for me is, that all search results appear to have 
score 1.0.

Maybe there is a wrong configuration in solrconfig.xml?

Thanks,
Manfred