Advanced Elasticsearch 7.0

Conditional execution in pipelines

As we mentioned in the Processors section, the optional if parameter is designed to let users define conditions for executing the pipeline processor. Let's demo a simple case with an example. The rating field of the documents in the index of cf_etf is a single space string when no rating is given for ETF in the original source. We can use the remove processor to remove the rating field in such a condition before the indexing operation, as shown in the following code block:

"pipeline": {     "description":"remove the rating field if the rating is equal to a single space string",     "processors":[{         "remove": {             "field": "rating",             "if": "ctx.rating == ' '"         }     }] }

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