Make search filter level function static
This is a legacy function but not used outside of the file. Make it static. Change-Id: I1d32c26aaf243202a7fa72056f5e74cf25bbb62a
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This is a legacy function but not used outside of the file. Make it static. Change-Id: I1d32c26aaf243202a7fa72056f5e74cf25bbb62a