> 1) Does Solr (Lucene) consider exact match to be something > more important ? I mean if the query is > "description:organisation", then > which one of the following would be returned? > Document A, consiting > just "description:organisation" , where > as Document B consisting "description:bla bla ... > organisation bla > bla.. ". Does it consider length of the field-text while > ranking ?
It is called length normalization which is done by default. It favors short documents. It punishes long documents. > 2) Let us assume that our query is "value0 field1:value1" . > So here, > if we use OR as the default operator its obvious that we > may get > results in which we might find dominating "value0" and no > "field1:value1" at all. We need some kind of mixture of > "OR" and > "AND", which gives more importance also for the "number of > keywords" > found. So I would like to find out whether we can edit some > kind of > boosting (or something relevant) to achieve this. Generally if a documents contains more query terms, it will get higher score. But it is not true all times since there are other parameters. For example a short document with only one query term might get higher score than a long document with containing two query terms. This link can be useful: http://lucene.apache.org/java/3_0_0/api/core/org/apache/lucene/search/Similarity.html
