From my experience about search crawling/indexing of SharePoint Online content after add/update/delete content in to lists/libraries. Usually SharePoint Online takes up to 15 min. time to crawl the content to make it available in search results. This time may increase based on content size of the site which will take to process them part of continuous crawling. Office 365 & SharePoint Online not provided any explicit option to start the crawl by end users and that will be maintained by Microsoft.
Also couple of things related to search in SharePoint Online below for developers who do not have idea,
1. We can use custom site columns data part of search result. SharePoint Online creates crawled properties of site columns by default and only we need to map them with managed properties. Go to site settings --> Site Collection Administration --> Search Schema, click on crawled properties and search with your site column, that will be appeared in the results and you can map that with managed property. After couple of hours, the managed property become available to use in search display templates.
2. Refiner/Sort - To refine/filter or sort search results based on particular site column, cannot do with our own managed properties. There are predefined managed properties available and those are started with Refinable (with different data types). These managed properties will be available to filter/sort when we use content search web part and search results web part. Only we need to map crawled properties to it.
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