public Builder mergeFrom(com.google.cloud.vertexai.api.SlackSource other) {
      if (other == com.google.cloud.vertexai.api.SlackSource.getDefaultInstance()) return this;
      if (channelsBuilder_ == null) {
        if (!other.channels_.isEmpty()) {
          if (channels_.isEmpty()) {
            channels_ = other.channels_;
            bitField0_ = (bitField0_ & ~0x00000001);
          } else {
            ensureChannelsIsMutable();
            channels_.addAll(other.channels_);
          }
          onChanged();
        }
      } else {
        if (!other.channels_.isEmpty()) {
          if (channelsBuilder_.isEmpty()) {
            channelsBuilder_.dispose();
            channelsBuilder_ = null;
            channels_ = other.channels_;
            bitField0_ = (bitField0_ & ~0x00000001);
            channelsBuilder_ =
                com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders
                    ? getChannelsFieldBuilder()
                    : null;
          } else {
            channelsBuilder_.addAllMessages(other.channels_);
          }
        }
      }
      this.mergeUnknownFields(other.getUnknownFields());
      onChanged();
      return this;
    }
<pre>
The Slack source for the ImportRagFilesRequest.
</pre>

Protobuf type {@code google.cloud.vertexai.v1.SlackSource}
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SlackSource.java