search and select substring Firebase Java

Question

I am trying to search my database and show the user the hashtag they searched for. So for e.g. if they search for #funny then that hashtag will show up in the recycler view.

Right now nothing shows up when I search for the hashtag. Can someone help me ?

private void searchHashTags(String user_word) {

    //Log.d("TAG1", "message is:" + user_word);

    DatabaseReference usersRef = FirebaseDatabase.getInstance().getReference("Video_Posts");
    Query query = usersRef.orderByChild("description").equalTo(user_word);

    query.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

            if (search_bar.getText().toString().equals("")) {
                recyclerHashTags.setVisibility(View.INVISIBLE);
            }

            Query query2 = usersRef.orderByChild("description").startAt(search_bar.getText().toString()).endAt(search_bar.getText().toString()+"\uf8ff");

            query2.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot snapshot) {

                    hashTags.clear();
                    for (DataSnapshot userSnapshot : snapshot.getChildren()) {
                        //mUsers.add(userSnapshot.getValue(User.class));

                        Post post = userSnapshot.getValue(Post.class);

                        Log.d("TAG5", user_word);

                        hashTags2.add(post.getDescription());
                        //hashTags2.add(post.getDescription());
                    }
                    adapterExplorer.notifyDataSetChanged();
                }

                @Override
                public void onCancelled(@NonNull DatabaseError error) {

                }
            });
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

            Log.d("Error name", error.getMessage());
        }
    });
}