Different sort field responses from different (but identical) nodes?

I have a 2 node cluster, and both nodes are identical (version, plugins,
memory - everything from the node API is identical other than the IPs and
Mac Addresses). The mappings for my indexes are also identical. My cluster
is also in Green state.

However, when I perform a search, the sort response field (which is a date
field) is different depending on the node the request hits.

For example, here is a result from node A (condensed for clarity):

{
"took": 189,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 6,
"max_score": null,
"hits": [
{
"_index": "egroup",
"_type": "invoice",
"_id": "6_12902",
"_score": null,
"_source": {...},
"sort": [
"P\u0002\u0000\u0000"
]
},
{
"_index": "egroup",
"_type": "invoice",
"_id": "6_10297",
"_score": null,
"_source": {...},
"sort": [
"P\u0002\u0000\u0000"
]
},
{
"_index": "egroup",
"_type": "cashBook",
"_id": "6_255",
"_score": null,
"_source": {...},
"sort": [
"20140103t000000z"
]
}
]
}
}

Check out the sort field - weird!

Here is a result from Node B (which is a correct response):

{
"took": 528,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 6,
"max_score": null,
"hits": [
{
"_index": "egroup",
"_type": "invoice",
"_id": "6_12902",
"_score": null,
"_source": {...},
"sort": [
1421712000000
]
},
{
"_index": "egroup",
"_type": "invoice",
"_id": "6_10297",
"_score": null,
"_source": {...},
"sort": [
1411430400000
]
},
{
"_index": "egroup",
"_type": "cashBook",
"_id": "6_255",
"_score": null,
"_source": {...},
"sort": [
-9223372036854776000
]
}
]
}
}

Anyone have any idea what is going on?

Thanks,

Tom.

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