RK-J

Currently, we check for validity of index names. However, Elasticsearch seems to have made some changes. So, please update that logic as follows.

Index names must meet the following criteria:

Lowercase only
Cannot include \, /, *, ?, ", <, >, |, ` ` (space character), ,, #
Indices prior to 7.0 could contain a colon (:), but that’s been deprecated and won’t be supported in 7.0+
Cannot start with -, _, +
Cannot be . or ..
Cannot be longer than 255 bytes (note it is bytes, so multi-byte characters will count towards the 255 limit faster)
Names starting with . are deprecated, except for hidden indices and internal indices managed by plugins