Search bots (Google, Yandex, Yahoo and others) use too much traffic.
This problem occurs because search bots index all possible filter combinations.
Solution: You can disable filter parameters indexation by specifying "Robots NoFollow Tag", "Robots NoIndex Tag" and "Rel NoFollow" in Catalog > Navigation > FIlters > select filter > Search Engine Optimization.
See more details on Improved Layered Navigation page
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