In JSON format, you can use a PATCH endpoint to modify the configuration of a search interface by adding attributes to it or changing the values of existing attributes. For example, the following endpoint modifies the configuration of the search interface All:

PATCH /gsadmin/v1/cloud/searchInterfaces/All

For example, suppose that the search interface All is currently configured as follows:

{
  "ecr:lastModifiedBy": "admin",
  "ecr:lastModified": "2016-07-07T17:17:07.474-04:00",
  "ecr:createDate": "2016-05-06T17:15:06.414-04:00",
  "ecr:type": "search-interface",
  "crossFieldMatch": "always",
  "fields": [
    { "attribute": "product.displayName" },
    { "attribute": "product.brand" },
    { "attribute": "ecr:crossField" },
    { "attribute": "product.category" }
  ]
}

You can add a snippet size attribute to this configuration by executing an endpoint above with the following input:

{
  "ecr:type": "search-interface",
  "fields": [
    {
      "snippetSize": 20,
      "attribute": "product.short_desc"
    }
  ]
}

The search interface ALL is now configured as follows:

{
  "ecr:lastModifiedBy": "admin",
  "ecr:lastModified": "2016-07-07T17:17:07.474-04:00",
  "ecr:createDate": "2016-05-06T17:15:06.414-04:00",
  "ecr:type": "search-interface",
  "crossFieldMatch": "always",
  "fields": [
    { "attribute": "product.displayName" },
    { "attribute": "product.brand" },
    { "attribute": "ecr:crossField" },
    { "attribute": "product.category" },
    {
      "snippetSize": 20,
      "attribute": "product.short_desc"
    }
  ]
}

You can also use to PATCH to modify the values of existing attributes. For example, size from 20 to 25, you can execute the PATCH method with the following input:

{
  "ecr:type": "search-interface",
  "fields": [
    {
      "snippetSize": 25,
      "attribute": "product.short_desc"
    }
  ]
}

Note: You cannot re-order the field members in a search interface using PATCH.