Changed "exact match boost" implementation to use a match_phrase query in should

[dryruffian]

Fixes

Fixes #4960 by @sarayourfriend

Description

This PR changes the simple_query_string query for boosting exact matches on the title to a match_phrase query, as suggested by @sarayourfriend. This change will save some parsing cycles in Elasticsearch and make our intention much clearer in code and in the generated query. I have also removed quotes_stripped variable as its not needed anymore.

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