I was just going through the default twig theme files in bolt CMS and came across the following lines of code:

 <p>{{ record.excerpt(300, false, search|default('')) }}</p>

Now i checked the bolt docs to see how the excerpt functions works and i came across the following lines of code:

Create a short excerpt from var, without HTML formatting, restricted by length characters. var can be a 'record' object, a single value from a 'record' or a regular string.*

But in the above peice of code there is a third parameter being passed which i dont quite understand I.E. search|default('') , Also what is false for ?

I was just glancing though the cheetsheet in the bolt docs HERE , but the definition listed there does't match the usage , can somebody clarify how this function works ??

bolt 数据库怎么读取所有的bucket？

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