playerAppearanceモデルのindex見直し

index名確認

`db.playerappearances.getIndexes()`

削除

```
db.playerappearances.dropIndex(
  "match_1_team_1_player_name_1"
)
```

新規作成

```
db.playerappearances.createIndex(
  { match: 1, team: 1, player_name: 1, number: 1 },
  {
    unique: true,
    partialFilterExpression: {
      player_name: { $type: "string" },
    },
  }
)
```