changing search result from only excerpt to full content

according to your 2nd piece of code you’re looking for the loop-search.php.

If you’re sure it’s using the content-search though change this line:

 <section class="entry">
        <?php
             the_excerpt();
        ?>
    </section><!-- /.entry -->

to

 <section class="entry">
        <?php
             the_content();
        ?>
    </section><!-- /.entry -->

or add more detail to the content:

the_content( 'Continue reading ' . get_the_title() );