diff --git a/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/constants/parameters_definition.tsx b/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/constants/parameters_definition.tsx
index 581b1223b7892..1277568b71bbd 100644
--- a/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/constants/parameters_definition.tsx
+++ b/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/constants/parameters_definition.tsx
@@ -100,14 +100,10 @@ const fielddataFrequencyFilterParam = {
       },
     },
   },
-  schema: t.intersection([
-    t.partial({
-      min: t.number,
-      max: t.number,
-      min_segment_size: t.number,
-    }),
-    t.brand(t.UnknownRecord, (v: any): v is any => !Array.isArray(v), 'Array'),
-  ]),
+  schema: t.record(
+    t.union([t.literal('min'), t.literal('max'), t.literal('min_segment_size')]),
+    t.number
+  ),
 };
 
 const analyzerValidations = [
diff --git a/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/lib/error_reporter.ts b/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/lib/error_reporter.ts
index 363ccfc2a5fab..e9beee1071597 100644
--- a/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/lib/error_reporter.ts
+++ b/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/lib/error_reporter.ts
@@ -3,14 +3,14 @@
  * or more contributor license agreements. Licensed under the Elastic License;
  * you may not use this file except in compliance with the Elastic License.
  */
-import { ValidationError, Validation } from 'io-ts';
+import { ValidationError } from 'io-ts';
 import { fold } from 'fp-ts/lib/Either';
 import { Reporter } from 'io-ts/lib/Reporter';
 
 export type ReporterResult = Array<{ path: string[]; message: string }>;
 
-export const failure = (validation: any): ReporterResult => {
-  return validation.map((e: ValidationError) => {
+const failure = (validation: ValidationError[]): ReporterResult => {
+  return validation.map(e => {
     const path: string[] = [];
     let validationName = '';
 
@@ -37,6 +37,6 @@ export const failure = (validation: any): ReporterResult => {
 const empty: never[] = [];
 const success = () => empty;
 
-export const ErrorReporter: Reporter<ReporterResult> = {
-  report: (validation: Validation<any>) => fold(failure, success)(validation as any),
+export const errorReporter: Reporter<ReporterResult> = {
+  report: fold(failure, success),
 };
diff --git a/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/lib/mappings_validator.ts b/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/lib/mappings_validator.ts
index 990d5ec961a6f..fff735da2e758 100644
--- a/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/lib/mappings_validator.ts
+++ b/x-pack/legacy/plugins/index_management/public/app/components/mappings_editor/lib/mappings_validator.ts
@@ -8,7 +8,7 @@ import * as t from 'io-ts';
 import { ordString } from 'fp-ts/lib/Ord';
 import { toArray } from 'fp-ts/lib/Set';
 import { isLeft, isRight } from 'fp-ts/lib/Either';
-import { ErrorReporter } from './error_reporter';
+import { errorReporter } from './error_reporter';
 import { ALL_DATA_TYPES, PARAMETERS_DEFINITION } from '../constants';
 import { FieldMeta } from '../types';
 import { getFieldMeta } from '../lib';
@@ -218,7 +218,7 @@ const mappingsConfigurationSchemaKeys = Object.keys(mappingsConfigurationSchema.
 const validateMappingsConfiguration = (
   mappingsConfiguration: any
 ): { value: any; errors: MappingsValidationError[] } => {
-  // Array to keep track of invalid configuration parameters.
+  // Set to keep track of invalid configuration parameters.
   const configurationRemoved: Set<string> = new Set();
 
   let copyOfMappingsConfig = { ...mappingsConfiguration };
@@ -228,7 +228,7 @@ const validateMappingsConfiguration = (
     /**
      * To keep the logic simple we will strip out the parameters that contain errors
      */
-    const errors = ErrorReporter.report(result);
+    const errors = errorReporter.report(result);
     errors.forEach(error => {
       const configurationName = error.path[0];
       configurationRemoved.add(configurationName);
diff --git a/x-pack/package.json b/x-pack/package.json
index e9238ef6634d0..ff4bd37a7ab1b 100644
--- a/x-pack/package.json
+++ b/x-pack/package.json
@@ -251,7 +251,7 @@
     "immer": "^1.5.0",
     "inline-style": "^2.0.0",
     "intl": "^1.2.5",
-    "io-ts": "^2.0.1",
+    "io-ts": "^2.0.5",
     "isbinaryfile": "4.0.2",
     "joi": "^13.5.2",
     "jquery": "^3.4.1",
diff --git a/yarn.lock b/yarn.lock
index 5fc1dba66de0e..9bf5bd1cba136 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -16375,10 +16375,10 @@ invert-kv@^2.0.0:
   resolved "https://registry.yarnpkg.com/invert-kv/-/invert-kv-2.0.0.tgz#7393f5afa59ec9ff5f67a27620d11c226e3eec02"
   integrity sha512-wPVv/y/QQ/Uiirj/vh3oP+1Ww+AWehmi1g5fFWGPF6IpCBCDVrhgHRMvrLfdYcwDh3QJbGXDW4JAuzxElLSqKA==
 
-io-ts@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/io-ts/-/io-ts-2.0.1.tgz#1261c12f915c2f48d16393a36966636b48a45aa1"
-  integrity sha512-RezD+WcCfW4VkMkEcQWL/Nmy/nqsWTvTYg7oUmTGzglvSSV2P9h2z1PVeREPFf0GWNzruYleAt1XCMQZSg1xxQ==
+io-ts@^2.0.5:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/io-ts/-/io-ts-2.0.5.tgz#e6e3db9df8b047f9cbd6b69e7d2ad3e6437a0b13"
+  integrity sha512-pL7uUptryanI5Glv+GUv7xh+aLBjxGEDmLwmEYNSx0yOD3djK0Nw5Bt0N6BAkv9LadOUU7QKpRsLcqnTh3UlLA==
 
 ip-regex@^2.1.0:
   version "2.1.0"