My default_smart.plist configuration that sets Finder spotlight to search files by name.

default_smart.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>CompatibleVersion</key>
    <integer>1</integer>
    <key>RawQuery</key>
    <string>((_kMDItemGroupId > 6))</string>
    <key>SearchCriteria</key>
    <dict>
      <key>CurrentFolderPath</key>
      <string>/</string>
      <key>FXCriteriaSlices</key>
      <array>
        <dict>
          <key>criteria</key>
          <array>
            <string>kMDItemKind</string>
            <integer>300</integer>
            <integer>400</integer>
          </array>
          <key>displayValues</key>
          <array>
            <string>Kind</string>
            <string>is</string>
            <string>any</string>
          </array>
          <key>rowType</key>
          <integer>0</integer>
          <key>subrows</key>
          <array/>
        </dict>
      </array>
      <key>FXScope</key>
      <integer>0</integer>
      <key>FXScopeArrayOfPaths</key>
      <array>
        <string>kMDQueryScopeComputer</string>
      </array>
      <key>SearchNameOnly</key>
      <true/>
    </dict>
    <key>Version</key>
    <string>10.4</string>
  </dict>
</plist>