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Is it index or indexes?
The word index is singular. One index.
If you have more than one, you can form the plural according to Latin conventions:
indices
or according to English conventions:
indexes.
Preference varies...
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What is the index?
in a book there is a section that tells you where things are.
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What is an index?
An index is in the back of a book that tells you what page number you will find a certain thing you are looking for.
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What is in an index?
the back of a book
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Why is the index finger called an index finger?
'To index' is to point out or to show something, so the finger with which you point out or show something is called the index finger, or just another way of calling it is the pointer finger.