Si tienes una app de FastAPI antigua, podrías estar usando Pydantic versión 1.

FastAPI ha tenido compatibilidad con Pydantic v1 o v2 desde la versión 0.100.0.

Si tenías instalado Pydantic v2, lo usaba. Si en cambio tenías Pydantic v1, usaba ese.

			<outputDirectory>fess-${project.version}/es/modules</outputDirectory>
		</fileSet>
		<!-- es/plugins -->
		<fileSet>
			<directory>${project.basedir}/plugins</directory>
			<outputDirectory>fess-${project.version}/es/plugins</outputDirectory>
		</fileSet>
		<!-- es/data -->
		<fileSet>
			<directory>src/main/assemblies/files</directory>
			<outputDirectory>fess-${project.version}/es/data</outputDirectory>
			<excludes>

## External Dependencies
* The supported etcd server version is 3.1.12, as compared to 3.1.10 in v1.9 ([#60998](https://github.com/kubernetes/kubernetes/pull/60998))
* The validated docker versions are the same as for v1.9: 1.11.2 to 1.13.1 and 17.03.x ([ref](https://github.com/kubernetes/kubernetes/blob/release-1.10/test/e2e_node/system/docker_validator_test.go))

          "url": "../${otherVariant.version}/${pom.artifactId}-${otherVariant.version}.jar"
        }
      ],
      "capabilities": [
        {
          "group": "com.google.guava",
          "name": "guava",
          "version": "${pom.version}"
        },
        {
          "group": "com.google.collections",
          "name": "google-collections",
          "version": "${pom.version}"
        }
      ]
    },

 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *

//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of

//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of

//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of

  <artifactId>scope-provided</artifactId>
  <version>1.0</version>
  <dependencies>

    <dependency>
      <groupId>maven-test-provided</groupId>
      <artifactId>scope-default</artifactId>
      <version>1.0</version>
    </dependency>

    <dependency>
      <groupId>maven-test-provided</groupId>
      <artifactId>scope-test</artifactId>
      <version>1.0</version>
      <scope>test</scope>
    </dependency>

  <artifactId>scope-runtime</artifactId>
  <version>1.0</version>
  <dependencies>

    <dependency>
      <groupId>maven-test-runtime</groupId>
      <artifactId>scope-default</artifactId>
      <version>1.0</version>
    </dependency>

    <dependency>
      <groupId>maven-test-runtime</groupId>
      <artifactId>scope-test</artifactId>
      <version>1.0</version>
      <scope>test</scope>
    </dependency>