Fix test

Author: luigidellaquila

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/220_explain.yml

@@ -51,9 +51,9 @@ explainRow:
   - match: {columns.0.name: "parsedPlan"}
   - match: {columns.0.type: "keyword"}
   - match: {columns.1.name: "optimizedLogicalPlan"}
-  - match: {columns.1.type: "text"}
+  - match: {columns.1.type: "keyword"}
   - match: {columns.2.name: "optimizedPhysicalPlan"}
-  - match: {columns.2.type: "text"}
+  - match: {columns.2.type: "keyword"}
 
 
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