What does "now/d" mean in elasticsearch

GET test_index/_search
{
"query": {
"bool": {
"must": [
{
"range": {
"timestamp": {
"gte": "now-1d/d",
"lte": "now"
}
}
}
]
}
}
}

I'am now able to understand what does query means.What does now-1d/d means and now/d means

Does https://www.elastic.co/guide/en/elasticsearch/reference/7.6/query-dsl-range-query.html#range-query-date-math-rounding explain it?

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