static DocServiceFilter ofPluginName(String pluginName) {
        requireNonNull(pluginName, "pluginName");
        return (plugin, service, method) -> pluginName.equals(plugin);
    }
Returns a {@link DocServiceFilter} which returns {@code true} when the name of the plugin matches the
specified {@code pluginName}. For Thrift, gRPC and Annotated service, use {@link #ofThrift()},
{@link #ofGrpc()} and {@link #ofAnnotated()}, respectively.
core/src/main/java/com/linecorp/armeria/server/docs/DocServiceFilter.java