<?php

// Add additional content to post during indexing in SearchWP.
add_filter( 'searchwp\source\post\attributes\content', function( $content, $args ) {
  if ( 48 !== $args['post']->ID ) {
    return $content;
  }
  
  // Add 'coffee" to the content for Page 48 so it can be searched.
  $content .= ' coffee';
  
  return $content;
}, 20, 2 );