Snippet for using Font-Awesome Plus and Minus icons on Bootstrap Accordions

font-awesome-accordion-toggle.js

jQuery('.accordion section').click(function() {
    jQuery(this).toggleClass('active').find('i').toggleClass('fa-plus fa-minus')
           .closest('section').siblings('section')
           .removeClass('active').find('i')
           .removeClass('fa-minus').addClass('fa-plus');

});

font-awesome-accordion-toggle.php

<?php if( have_rows('about_content', 4) ): $i = 0; ?>

<div id="about" class="questions">

	<div class="container">
	
		<div id="section" class="row">
					
			<div class="col-sm-12 accordion">

			<?php while( have_rows('about_content', 4) ): the_row(); $i++; ?>
		
						<section>			
							<div class="title"><i class="accordion_icon fa fa-plus"></i>
								<a data-toggle="collapse" data-parent="#accordion" href="#collapse-<?php echo $i; ?>"><?php the_sub_field('title'); ?>
							</div>
		    
							<div class="row"><div class="col-sm-10">
							<p class="excerpt"><?php the_sub_field('sub_title'); ?></p></a>
							<div id="collapse-<?php echo $i; ?>" class="panel-collapse collapse accordion-content">
								<?php the_sub_field('expanded_copy'); ?>
								
							<?php 
 
							while(has_sub_field("flexible_content")): ?>
							 
								<?php if(get_row_layout() == "two_column_row"): // layout: Content ?>
								
								<div class="row">
								
									<div class="col-sm-6">
								 
										<strong><?php the_sub_field("left_column_title"); ?></strong>
										
										<?php the_sub_field("left_column_list"); ?>
											
									</div>
									
									<div class="col-sm-6">
								 
										<strong><?php the_sub_field("right_column_title"); ?></strong>
										
										<?php the_sub_field("left_column_list"); ?>
											
									</div>
										
								</div>
							 
								<?php endif; ?>
							 
							<?php endwhile; ?>
								
							</div>
							</div></div>
																												
						</section>
		
			<?php endwhile; ?>

			</div>
						 
		</div>
						
	</div>

</div>

<?php endif; ?>