Duplicate Results Following Upgrade to 1.2.0 & SortScript

The following query is now returning duplicate documents following the
upgrade to 1.2.0, was this an intentional change that's documented

"from": 0,
"size": 25,
"sort": {
"_script": {
"order": "desc",
"type": "number",
"script": "(doc['id'].value + salt).hashCode()",
"params": {
"salt": "TMJHXYFHHR"
"query": {
"term": {
"featured": {
"value": "true"

The cluster has 2 nodes and the index has the default of 5 shards.

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