Index delete problem

[QingZ11]

Describe the bug (required)

Statement drop tag index deletes the edge index unexpectedly, and vice versa for the deletion of the tag index.

Your Environments (required)
Version: v2.6 and previous versions

How To Reproduce(required)

(root@nebula) [nba]> create tag A(a int)
Execution succeeded (time spent 2126/2508 us)

(root@nebula) [nba]> create edge E(a int)
Execution succeeded (time spent 2039/2379 us)

(root@nebula) [nba]> create tag index a_index on A(a)
Execution succeeded (time spent 1959/2310 us)

(root@nebula) [nba]> create edge index e_index on E(a)
Execution succeeded (time spent 2097/2452 us)

(root@nebula) [nba]> drop tag index e_index
Execution succeeded (time spent 1572/1963 us)

(root@nebula) [nba]> drop edge index a_index
Execution succeeded (time spent 1702/2114 us)

Expected behavior

An error should be reported when trying to delete an edge index with statement drop tag index e_index, and vice versa.

Additional context
Maybe we should reconsider similar grammatical design to avoid ambiguity and unfriendliness to users.

[czpmango]

Additional context
Maybe we should reconsider similar grammatical design to avoid ambiguity and unfriendliness to users.