Well, it's very easy to rule out the first option (since “entrys” is not a word). Let's forget the prepositional phrase (“of N word-to-be-decided”) for now. How would you phrase the sentence with varying numbers? “0 entry selected” or “0 entries selected”? (Ignoring that many style guides will tell you spell out the numeral), the latter is correct. “1 entry selected" or “1 ...
Column heads and stubs [entries in the leftmost column of the table] must match one another in style across a series of tables. Spelling, capitalization, punctuation, abbreviations, and symbols must likewise be regularized.
None of the other definitions in the MW entry for index —and none of the six entries for index as a noun in AHDEL —indicate a "usu" plural form of index as between indexes and indices.
I always get a little flustered by the question of how to punctuate the end of each of my table entries, where the table is part of a longer document primarily composed of traditional sentences but...
Duplicate Data: Entries that have been added by a system user multiple times, for example, re-registering because you have forgotten your details. Duplicated Data: Someone has deliberately taken a precise duplicate of the data - or a proportion of it - maybe for backup or reporting purposes. It may have been accidentally added to the original.
Actually, the first three entries in dictionary.com seem to convey this meaning. So, the "so far" part means "up to now" and the "so good" part means "it is good in this manner/condition".
One important bit of context that might help from those OED entries: a hallmark "originally" is a physical stamp on a piece of silver conveying permanent, unchangeable information about it; whereas trappings referred to an ornate set of gear for a horse – gear that someone had put on and could in principle change.