What index option needs to be changed only exact substrings are considered matches?

[jkwilliams375]

I have a search index and some data to search over. When I search 'cop' over the data, I get back matches for words: 'cooped', 'copped', 'cop'. I do want forward indexing so that searching 'cop' returns 'cop' as well as 'copped'. But how can I modify this index's settings so that it does not return 'cooped' since the substring 'cop' does not actually exist in the word? Results should be: 'cop', 'copped'.

const options: FlexSearch.IndexOptions<string> = {
	charset: 'latin:extra',
	preset: 'match',
	tokenize: 'forward',
	cache: false,
	filter: ['and'],
};

const index = new Index(options);

const recipes = [
	{ id: 1, title: 'Orange cake' },
	{ id: 2, title: 'New York-Style Bacon Egg and Cheesiness Sandwich' },
	{ id: 3, title: 'Bacon Wrapped Cheese Stuffed Meatloaf' },
	{ id: 4, title: 'French Yogurt Cake' },
	{ id: 5, title: 'Gougeres (French Cheese Puffs)' },
	{ id: 6, title: 'Authentic Brazilian Cheesy Bread (Pão de Queijo)' },
	{ id: 7, title: 'Camarão na Moranga (Brazilian Shrimp Stuffed Pumpkin)' },
	{ id: 8, title: 'Parmesan Cheesed Muffins' },
	{ id: 9, title: 'Cookie Dough Stuffed Oreos' },
	{ id: 10, title: 'You need to cut it then run it' },
	{ id: 11, title: 'here is image to registration document page foo bar' },
	{ id: 12, title: 'cool runnings movie' },
	{ id: 13, title: 'post malone sings the cooped up song' },
	{ id: 14, title: 'i copped shoes' },
	{ id: 15, title: 'i saw a cop eating donuts' },
];
recipes.forEach(recipe => {
	index.add(recipe.id, recipe.title);
});

const searchTerm = 'cop';
console.log('searching for word: ' + searchTerm);

const ids = index.search(searchTerm);
console.log(ids.length + ' ids found in search: ' + ids);

const result = recipes.filter(recipe => ids.includes(recipe.id));
console.log(result);
// returns ids 13,14,15