When you run programs, you computer heats up naturally. Minecraft takes more processing resources, and laptops are so compact that they heat up pretty quickly, that's why you always hear the fans. Laptops don't have amazing cooling, so ultimately they get super hot.
The only way to slow heating of a laptop would be to lower Minecraft's CPU usage. If it's a constant problem for you, I recommend you upgrade/replace your fan or buy a cooling pad. Also, there may be dust built up inside, and you can try buying a can of compressed air to clean it out.
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I'm currently accepting applications for a private, vanilla server. If you are interested, you can check it out here.