To use the compare condition, you specify the value in the execution context that you want to evaluate, a comparison operator, and the value you want to compare against. For example, the following compare condition returns true if the number of the total hits in the search result is greater than or equal to 5:

{
  "condition" : {
    "compare" : {
      "ctx.payload.hits.total" : { 
        "gte" : 5 
      }
    }
  }
}

When comparing dates and times, you can use date math expressions of the form <{expression}>. For example, the following expression returns true if the watch was executed within the last five minutes:

{
  "condition" : {
    "compare" : {
      "ctx.execution_time" : {
        "gte" : "<{now-5m}>"
      }
    }
  }
}

You can also compare two values in the execution context by specifying the compared value as a path of the form of {{path}}. For example, the following condition compares the ctx.payload.aggregations.status.buckets.error.doc_count to the ctx.payload.aggregations.handled.buckets.true.doc_count:

{
  "condition" : {
    "compare" : {
      "ctx.payload.aggregations.status.buckets.error.doc_count" : {
        "not_eq" : "{{ctx.payload.aggregations.handled.buckets.true.doc_count}}"
      }
    }
  }
}

You use "dot-notation" to access values in the execution context. Values loaded into the execution context by the input are prefixed by ctx.payload.

You can reference entries in arrays using their zero-based array indices. For example, to access the third element of the ctx.payload.hits.hits array, use ctx.payload.hits.hits.2.