You can:
Change the index index file, for example.
class BlogEntryIndex(SearchIndex): text = CharField(document=True, use_template=True) title = CharField(model_attr='title', boost=1.125)
NOTE. As stated in the comments, below will only be the title of the term, not the field, use the above.
or you can pass the promotion to SearchQuerySet, for example, in your haystack url file.
sqs = SearchQuerySet().boost('title', 1.125) urlpatterns = patterns('haystack.views', url(r'^$', SearchView(searchqueryset=sqs), name='haystack_search'), )
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