Issue with an oak index using snonym filter

Hey guys,

I have a custom index which is working totally fine if i do not add any analyzers to it. I added an analyzer for adding a synonym to return similar results for "fact sheets" and factsheets. Index stopped working after that.

Any help with it is appreciated.

Thank you!

Here is the index

<?xml version="1.0" encoding="UTF-8"?>

<jcr:root xmlns:oak="http://jackrabbit.apache.org/oak/ns/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"

          jcr:primaryType="oak:Unstructured"

          async="async"

          compatVersion="{Long}2"

          evaluatePathRestrictions="{Boolean}true"

          reindex="{Boolean}true"

          type="lucene">

    <indexRules jcr:primaryType="nt:unstructured">

        <nt:base

            jcr:primaryType="nt:unstructured"

            includePropertyTypes="all">

            <properties jcr:primaryType="nt:unstructured">

                <literatureTitle name="literatureTitle"

                    analyzed="{Boolean}true"

                    ordered="{Boolean}true"

                    jcr:primaryType="nt:unstructured"/>

                <displayContentTypename name="displayContentTypename"

                    analyzed="{Boolean}true"

                    jcr:primaryType="nt:unstructured"/>

            </properties>

        </nt:base>

    </indexRules>

    <analyzers jcr:primaryType="nt:unstructured">

        <default jcr:primaryType="nt:unstructured">

            <filters jcr:primaryType="nt:unstructured">

                <LowerCase jcr:primaryType="nt:unstructured"/>

                <Synonym jcr:primaryType="nt:unstructured"

                synonyms="synonym.txt">

                    <synonym.txt/>

                </Synonym>

            </filters>

        </default>

    </analyzers>

</jcr:root>

and in synonym.txt i have

fact sheets, factsheets