visual-composer-autocomplete.php

<?php 

/**
 * Get all type posts
 *
 * @return void
 * @author alispx
 **/
function alispx_get_type_posts_data( $post_type = 'post' ) {

	$posts = get_posts( array(
		'posts_per_page' 	=> -1,
		'post_type'			=> $post_type,
	));

	$result = array();
	foreach ( $posts as $post )	{
		$result[] = array(
			'value' => $post->ID,
			'label' => $post->post_title,
		);
	}
	return $result;
}


add_action( 'vc_before_init', 'alispx_post_finder_integrateWithVC' );
function alispx_post_finder_integrateWithVC() {
   vc_map( array(
		'name' 					=> esc_html__( 'Alispx Post Finder', 'alispx' ),
		'base' 					=> 'alispx_post_finder',
		'class' 				=> 'alispx-ico',
		'icon' 					=> 'alispx-ico',
		'category' 				=> esc_html__( 'Features', 'alispx' ),
		'admin_enqueue_css' 	=> array( get_template_directory_uri . '/your-path/alispxvc.css' ),
		'description' 			=> esc_html__( 'Alispx Post Finder', 'alispx' ),
		'params' 				=> array(
			array(
				'type' 			=> 'autocomplete',
				'class' 		=> '',
				'heading' 		=> esc_html__( 'Post Name', 'alispx' ),
				'param_name' 	=> 'id',
				'settings'		=> array( 'values' => alispx_get_type_posts_data() ),
			),
		)
	) );
}

Replace $tag with vc_map 'base' field and $param_name with autocomplete field param name

add_filter( "vc_autocomplete_{$tag}_{$param_name}_callback", function ( $query, $tag, $param_name ){
   
   $args = [
      'fields' => 'ids'
   ];
   
   if( $query ){
      $args['s'] = $query;
   }
   
   $data= [];
   
   foreach ( get_posts( $args ) as $id ) {
      $data[] = [
         'value' => $id,
         'label' => get_the_title( $id )
      ];
   }

   return $data;
  
}, 20, 3 );

add_filter( "vc_autocomplete_{$tag}_{$param_name}_render", function ( $value, $settings, $tag ){
   
   $value['label'] = get_the_title($value['value']);
   return $value;
  
}, 20, 3 );