@svignesh1994 It’s default robots.txt on every blogger blog. And I think it will fix the problem because Googlebot can’t crawl search directory in next time. So look’s like OP have already custom robots.txt which is not correct.
And 404 pages which does not carry any link power/PageRank/Juicyrank then it does not add any negative/postive value in terms of SEO. You can ignore it, and Google will drop that after long time. So 404 does not hurt ranking.