I have tried tracker-processes -r but the problem still persists.

following is the result of command execution.
Found 148 pids...
Found process ID 2428 for 'trackerd'
Killed process 2428
Found process ID 3556 for 'tracker-indexer'
Killed process 3556
Setting database locations
Checking database directories exist
Checking database version
Checking database files exist
Could not find database file:'/root/.local/share/tracker/data/common.db'
One or more database files are missing, a reindex will be forced
Removing all database files
Removing database:'/root/.local/share/tracker/data/common.db'
Removing database:'/tmp/tracker-root/cache.db'
Removing database:'/root/.cache/tracker/file-meta.db'
Removing database:'/root/.cache/tracker/file-contents.db'
Removing database:'/root/.cache/tracker/email-meta.db'
Removing database:'/root/.cache/tracker/email-contents.db'
Setting index database locations
Checking index directories exist
Checking index files exist
Could not find index file:'/root/.cache/tracker/file-index.db'
Could not find index file:'/root/.cache/tracker/email-index.db'
Removing all database index files
Removing database index:'/root/.cache/tracker/file-index.db'
Removing database index:'/root/.cache/tracker/email-index.db'