Range query doesn't return all documents in index

I've a problem. Each time Range query doesn't return the same number of documents.
This is my query:

GET muv-tweet-full*/_search
"query": {
"range" : {
"spam_prediction_probability" : {
"gte" : 0.15,
"lte" : 0.85

But each time vary the total hits number.
Any ideas?

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