Percolator example (training MUC)

sample.json

DELETE back_in_stock_notifications
DELETE test

PUT test/_bulk?refresh
{ "index" : { "_id" : "1"}}
{ "id": "1", "title" : "T-Shirt", "size" : "XL", "color": "red", "stock" : 0 }
{ "index" : { "_id" : 2}}
{ "id": "2", "title" : "T-Shirt", "size" : "XL", "color": "green", "stock" : 1 }
{ "index" : { "_id" : 3}}
{ "id": "3", "title" : "T-Shirt", "size" : "XL", "color": "yellow", "stock" : 2 }

GET test/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "range": {
            "stock": {
              "gte": 1
            }
          }
        },
        {
          "match": {
            "title": "shirt"
          }
        }
      ]
    }
  }
}

# Damn red is not on stock! Let's get a notification if it is back in stock
PUT back_in_stock_notifications
{
  "mappings": {
    "properties": {
      "query": {
        "type": "percolator"
      },
      "stock" : { "type" : "long"},
      "id" : { "type" : "keyword"}
    }
  }
}

PUT back_in_stock_notifications/_doc/1?refresh=true
{
  "email": "alex@elastic.co",
  "query": {
     "bool": {
      "must": [
        {
          "range": {
            "stock": {
              "gt": 0
            }
          }
        },
        {
          "match": {
            "id": "1"
          }
        }
      ]
    }
  }
}


# uhuh! back in stock
PUT test/_bulk?refresh
{ "index" : { "_id" : 1}}
{ "id": "1", "title" : "T-Shirt", "size" : "XL", "color": "red", "stock" : 100 }

GET back_in_stock_notifications/_search
{
  "query": {
    "percolate": {
      "field": "query",
      "document": {
        "id": "1",
        "title": "T-Shirt",
        "size": "XL",
        "color": "red",
        "stock": 100
      }
    }
  }
}

# show me the emails only!
GET back_in_stock_notifications/_search?filter_path=**.email
{
  "query": {
    "percolate": {
      "field": "query",
      "document": {
        "id": "1",
        "title": "T-Shirt",
        "size": "XL",
        "color": "red",
        "stock": 100
      }
    }
  }
}

GET back_in_stock_notifications/_search?filter_path=**.email
{
  "query": {
    "percolate": {
      "field": "query",
      "index" : "test",
      "id" : "1"
    }
  }
}

# further use-cases
# get notified about changing stock values
# register criteria for searching a new flat/house
# simple classification for ads based on the document content