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https://issues.apache.org/jira/browse/SOLR-3145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228584#comment-13228584
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Uwe Schindler commented on SOLR-3145:
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bq. Rather strong/blanket statement. It seems roughly true that adding
non-trivial words to a google search lowers the number of matches.
This "seems" to be true in lot's of cases. But if you search Google for "google
number of results" you will see pages from all over the internet discussing
this topic. Even Google states in its FAQ that the number of results is just a
guess and depends on various factors that appear quite random, there is no
relationship in counts regarding adding/removing terms. Even the same search
returns largely different counts when you change pages (e.g. going from page
1->2 completely changes the count). The reason for this is of course query
preprocessing, different search clusters and user-specific preferences. To get
a more solr-like result, use "wortwörtlich" (German) / "verbatim" (English) on
the left sidebar.
Lot of people simply say: the google count is just arbitrary and useless for
any metrics.
> Velocity /browse GUI should stick to AND as defaultOperator
> -----------------------------------------------------------
>
> Key: SOLR-3145
> URL: https://issues.apache.org/jira/browse/SOLR-3145
> Project: Solr
> Issue Type: Improvement
> Components: web gui
> Affects Versions: 4.0
> Reporter: Jan Høydahl
> Assignee: Jan Høydahl
> Fix For: 4.0
>
> Attachments: SOLR-3145.patch
>
>
> After SOLR-1889 was committed, the DisMax "mm" parameter defaults to whatever
> set in q.op. Since defaultOperator in schema.xml is OR, this means that
> DisMax now defaults to OR (mm=0) instead of the old default (mm=100%). It
> should stick to AND as before.
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