private com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory,
            com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory.Builder,
            com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectoryOrBuilder>
        getEphemeralDirectoriesFieldBuilder() {
      if (ephemeralDirectoriesBuilder_ == null) {
        ephemeralDirectoriesBuilder_ =
            new com.google.protobuf.RepeatedFieldBuilderV3<
                com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory,
                com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory.Builder,
                com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectoryOrBuilder>(
                ephemeralDirectories_,
                ((bitField0_ & 0x00004000) != 0),
                getParentForChildren(),
                isClean());
        ephemeralDirectories_ = null;
      }
      return ephemeralDirectoriesBuilder_;
    }
<pre>
Optional. Ephemeral directories which won't persist across workstation
sessions.
</pre>

<code>
repeated .google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory ephemeral_directories = 22 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java