Lucene / Add searching and indexing per field analyzers

[fxp]

Currently the same PerFieldAnalyzer is used at indexing and searching time. In some case, an analyzer could be applied at indexing and another at searching time. For example when using a SynonymAnalyzer. We only need synonym expansion during indexing or during searching, not both.

By default, searching analyzer is the same as indexing analyzer.

Example configuration in config-lucene.xml:

<fieldSpecificSearchAnalyzer>
    <Field name="loc" analyzer="org.apache.lucene.analysis.standard.StandardAnalyzer"/>
</fieldSpecificSearchAnalyzer>

Which will overrides indexing analyzer for the field:

  <fieldSpecificAnalyzer>
    ...
    <Field name="loc" analyzer="org.fao.geonet.kernel.search.geonames.SynonymAnalyzer"/>

[fxp]

Committed revision 9119.