@JsonProperty("undeleted")
    public Builder isUndeleted(boolean isUndeleted) {
      this.isUndeleted = isUndeleted;
      return this;
    }
Sets isUndeleted flag of the {@link MessageInfo} to build.
@param isUndeleted the isUndeleted to set.
@return This builder.
ambry-api/src/main/java/com/github/ambry/store/MessageInfo.java