Filler only applies to series with a myth arc like One Piece, Bleach, etc since it's defined as stuff that doesn't advance the plot, characterization, setting in any way, in other words, it can be easily removed without influencing the story at all.
But K-On!, most slice of life, and episodic series, lack a myth arc so using the word filler doesn't really make sense and is arguably missing the point.
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