public Builder removeEphemeralDirectories(int index) {
      if (ephemeralDirectoriesBuilder_ == null) {
        ensureEphemeralDirectoriesIsMutable();
        ephemeralDirectories_.remove(index);
        onChanged();
      } else {
        ephemeralDirectoriesBuilder_.remove(index);
      }
      return this;
    }
<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