I used the migration plugin and it said I can migrate without re-indexing, but I'm getting this error :
java.lang.IllegalStateException: unable to upgrade the mappings for the index [mi_2015_07_w4], reason: [Mapper for [_timestamp] conflicts with existing mapping in other types: [mapper [_timestamp] has different [store] values, mapper [_timestamp] has different [doc_values] values, cannot change from disabled to enabled]] at org.elasticsearch.cluster.metadata.MetaDataIndexUpgradeService.checkMappingsCompatibility(MetaDataIndexUpgradeService.java:339) at org.elasticsearch.cluster.metadata.MetaDataIndexUpgradeService.upgradeIndexMetaData(MetaDataIndexUpgradeService.java:116) at org.elasticsearch.gateway.GatewayMetaState.pre20Upgrade(GatewayMetaState.java:228) at org.elasticsearch.gateway.GatewayMetaState.<init>(GatewayMetaState.java:87)
I don't understand what it means exactly and whether I have to re-index everything (2B records). This says that the _timefield is just deprecated :
Could pls anybody help me with this?