Boosting is used to increase the score of the certain documents. You can use index time boosting or query time boosting. For index time boosting you can set boost attribute and value to the document you index. For query time boosting you can either boost field by setting your boost value, or you can use predefined function queries.
For more information about boosting check documents in Solr wiki.
boost=popularity means that documents popularity is calculated in the external field (using ExternalFileField) and used to increase the score by using popularity value. Popularity of the documents can be calculated using the view count or any other parameters you want.For more about boosting documents by popularity you can check this document.
Read full article from what document popularity in Solr document indexing? - Stack Overflow
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