Does indexer process always use cpu?

I havent do any thing,no query,no index,but the index servers CPU usage is always high,Is it normal?

I look up the indexer.log then find it print a error periodically that is " [Error] ForestDB Error (data.fdb.136/default) errcode: -1, msg: Error in REMOVE on a database file ‘/opt/couchbase/var/lib/couchbase/data/@2i/PriceCheckDB_second_#primary_2167015519368835099_0.index/data.fdb.151’, errno = 2: ‘No such file or directory’ "

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