NullPointerException when settings "es.read.field.as.array.include" options

Hello,

Nop, there are plenty issues with array (latest I found => Bug when reading if a field has no mapping (empty array by ex.) drive me crazy ^^).

So, I removed array for flat structure, no problem like that.

(having fields like toto_1:, toto_2: , toto_3 instead of toto: [])