Getting total term frequency throughout entire index (Elasticsearch)
I believe you need to turn term_statistics to true as per elasticsearch documentation:
Term statistics Setting term_statistics to true (default is false) will return
total term frequency (how often a term occurs in all documents)
document frequency (the number of documents containing the current term)
By default these values are not returned since term statistics can have a serious performance impact.
The reason for the difference in the count is because term vectors are not accurate unless the index in question has a single shard. For indexes with multiple shards, the documents are distributed all over the shards, hence the frequency returned isn't the total but from a randomly selected shard.
Thus, the returned frequency is just a relative measure and not the absolute value you expect. see the Behaviour section. To test this, you can create a single shard index and request the frequency (it should give you the actual total).