Unfortunately there is no such possibility in Confluence administration. A similar feature request is still open: https://jira.atlassian.com/browse/CONF-15619
You have to write a plugin that provides a lucene-boosting-strategy module: https://developer.atlassian.com/display/CONFDEV/Lucene+Boosting+Strategy+Module
By using an external search appliance integrated (indexing your Confluence data), you can get finer control on your weighting and search content algorithms.
The way I look at it, Confluence is a wiki and really good at that. Really really good.
Atlassian does not also try to be a Search Appliance corp - to which there are numerous whole companies dedicated to that problem in and of itself.
AppFusions has worked on a few solutions in this area - contact us at info[at]appfusions[dot]com for more info, if interested.
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