There wouldn't usually be insurance fraud if an insurance company agrees to cover a risk such an a dispute over an easement. It would have to be an unusual type of dispute for homeowners insurance to cover it. If the easement was not disclosed by the title company then it would be covered by title insurance.
I agree with both previous answer and I have had several cases that homeowners insurance tenders a defense to a lawsuit and sometimes easments are involved. I always ask my clients to make a claim because sometimes an umbrella policy or homeowners policy will tender a defense and that can be a big help.
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More facts would have to be shared to evaluate this question. Your homeowners insurance generally covers two things: property loss; and liability. If your friend is being sued by his neighbor for something to do with the easement, he may have coverage for his potential liability under his HO policy. Under that situation, the HO insurance company would step in and provide him with a defense. That typically includes hiring an investigator or an attorney to look into the facts. The costs of that are picked up by the insurance company. As I say, without more facts, it's hard to know how the insurance company got involved or what role they are playing.