public Builder clearFilter() {
        filter_ = getDefaultInstance().getFilter();
        bitField0_ = (bitField0_ & ~0x00000002);
        onChanged();
        return this;
      }
<pre>
An optional list of query parameters specified as JSON text in the
form of:

`{"agentPoolNames":["agentpool1","agentpool2",...]}`

Since `agentPoolNames` support multiple values, its values must be
specified with array notation. When the filter is either empty or not
provided, the list returns all agent pools for the project.
</pre>

<code>string filter = 2;</code>

@return This builder for chaining.
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferProto.java