add filter for highlight mixin

[Mr-win7]

when I was using highlight mixin, I found that some arguments like 'page=2' were highlighted and I had no choice but rewrite the to_presentation method. Due to #126 , I cannot use SearchQuerySet.highlight() and rewrite the get_request_filters method. Could you please add a field for remove some argument of highlight mixin?

Here is some information. Django==1.11 django-haystack==2.8.1 djangorestframework==3.8.2 drf-haystack==1.8.2

[atmishra]

Can I work on this?

[rhblind]

Absolutely 😁

[atmishra]

Thanks! Can you assign it to me? I have started working on this.

[ajiteshr7]

Is this WIP? or abandoned?

[jysatuo]

seems i‘m too late，I have the same issue，i fixed it just replace ret["highlighted"] = instance.highlighted[0] to ret["highlighted"] = instance.highlighted["text"].