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Discover Ludwig"only indication" is correct and can be used in written English.
You can use it when you want to convey that something is the single piece of evidence or the main source of information. For example, "The only indication we had that something was wrong was a slight bumping sound coming from the engine."
Exact(60)
It was the only indication I saw of drug use.
The only indication of receipt, after all, was a reply.
And the only indication of a lingering drug problem was a few soldiers patrolling the highway.
"This is not the only indication of that," the official said.
Testimonials from business travelers are not the only indication of United's versatility in the months ahead.
The only indication of real nostalgia involved one of them, The New York Observer.
The only indication that anything had changed was the "For Sale" sign on the lawn.
The only indication that something was off was the movie she decided to watch.
A bright halo, shimmering and alive, was the only indication of its existence.
A sign inside was the only indication of the recent trouble.
"Sometimes pieces of paper taped to the wall were the only indication for the station".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com