Revert "fix users suggestion on type hashtag"

This reverts commit 62daed76bbf488670c0e6b4cdc1e49e8a3388dd0.
Revert "search valid usernames and hashtags"

This reverts commit d75cf96f25b6311786523fef048e33c593a1ba08.
Revert "search hashtags"

This reverts commit b72c3d438bf179df8dc09e53bec1dc455cf80fdf.