Remove products from search

can you post your code snippet that you used on portfolio?
a portfolio is nothing else than a custom post type as woocommerce products too.

i only do know that there is an include snippet – all posttypes that are not listet ( as: product ) are then excluded

function exclude_from_search($query) {
  if ( !$query->is_admin && $query->is_search) {
     // include the posttype that should be included to search results
    $query->set('post_type', array('page', 'post', 'portfolio') );
  }
  return $query;
}
add_filter( 'pre_get_posts', 'exclude_from_search' );

if you do not like the portfolios – just remove it from array

btw. the ajax search has its own query ! If you like to influence this too …

thanks: didn’t know about that extra filter in portfolio registration

did you try
for ajax search ( thats the menu search) :

function avf_ajax_search_query_mod( $search_parameters ){
  $defaults = array(
    'numberposts' => 5, 
    'post_type' => array( 'page', 'post' ), 
    'post_status' => 'publish', 
    'post_password' => '', 
    'suppress_filters' => false
  );
  $_REQUEST['s'] = apply_filters( 'get_search_query', $_REQUEST['s']);
  $search_parameters = array_merge( $defaults, $_REQUEST );
  return $search_parameters;
}
add_filter('avf_ajax_search_query', 'avf_ajax_search_query_mod', 10, 1);

and in addition for search resultspage :

function post_types_for_search_results($query) {
  if ( !$query->is_admin && $query->is_search) {
    $query->set('post_type', array('page','post') );
    $query->set('post_status', array( 'publish' ) );
  }
  return $query;
}
add_filter( 'pre_get_posts', 'post_types_for_search_results' );

In this case, your code snippet would be unnecessary.
btw: because of new cpt support in enfold – there is a similar filter for any other cpt: avf_custom_elements_cpt_args – maybe it is possible to use it for specific post-types ( portfolio, product, etc. to have that analog to your code snippet.

Yes and the snippets above do only allow to show pages and posts ( so if product is not in that array – it will not be shown)
the first is for having only posts and pages in that ajax search ( that is the menu search icon )
i can not test it because i got no page at the moment with woocommerce .
But with Portfolio it works this way.