Exclude a file from bash script in Hugo

Question

This code converts Hugo's markdown posts to page bundles. However, would anyone kindly help with showing how to edit the code to exclude the _index.md file from being converted?

for FILE in *.md
do
  # remove the last dot and subsequent chars to name the folder from the .md
  DIR="${FILE%.*}"
  mkdir -p "$DIR"
  mv "$FILE" "$DIR"
done
find ./ -iname '*.md' -execdir mv -i '{}' index.md \;